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After 'please', we use the base form of the verb without 'to' (bare infinitive). 'Switch off' is the correct base form. 'Switched off' is past tense, 'switching off' is present participle, and 'switch of' is grammatically incorrect.

The sentence requires the past participle 'announced' to form the passive voice 'were announced' by the University. The passive voice indicates the University performed the action of announcing. 'Announce' is base form, 'being announce' is grammatically incorrect, and 'announcing' is present participle.

The past continuous tense 'was jumping' is correct because it describes an action that was in progress when another past action occurred (when I saw him). The other options are grammatically incorrect: 'jump' is base form, 'was jumped' is passive (incorrect context), and 'jumped' is simple past.

Future continuous tense describes an action that will be in progress at a specific time in the future. For first person subjects (I/we), traditional grammar prescribes 'shall be' though modern usage widely accepts 'will be'. Both are grammatically correct, but 'shall be' follows the traditional prescriptive rule.

Simple past tense is required here to describe a completed action or state. 'Felt' is the past tense of 'feel'. Since this describes a continuing state during imprisonment, simple past (not present tense 'feel' or continuous 'feeling') is grammatically appropriate.

'Illicit' specifically means forbidden by law, rules, or custom, making it perfect for unauthorized romantic relationships. 'Illegal' refers to criminal acts, 'unlawful' is broader, and 'illegitimate' refers to unauthorized births or invalid legal status. 'Illicit' precisely captures the context of forbidden affairs.

Phrasal verbs have specific meanings. 'Looked round' means checking surroundings in all directions, which is logical before crossing a road. 'Looked for' means searching, 'looked on' means watching as spectator, and 'looked out' means watching for danger or being careful. The context of road-crossing suggests checking all around.

The sentence needs the past tense of 'overtake'. 'Overtook' is the correct past tense form, meaning to catch up with and pass. 'Over take' is incorrect (two words, infinitive form), 'over hand' is not a standard verb, and 'over turn' means to flip or capsize, which doesn't fit the context of a chase.

Prepositions of place and arrival: 'at' indicates arrival at a specific point or destination. 'To' suggests direction toward, 'along' means following the length of, and 'till' indicates time duration, not place. When describing arrival at a location, 'arrive at' is the standard prepositional phrase.

Third conditional sentences describe hypothetical past situations. Structure: If + past perfect, would + have + past participle. 'Would have paid' is correct as it pairs with the past perfect 'had' in the if-clause. 'Paid' is wrong (no auxiliary), 'had paid' doesn't fit after 'would', and 'pay' is present tense.

Adverbs modify verbs, adjectives, or other adverbs. 'Necessarily' is the adverb form meaning 'inevitably' or 'as a logical consequence'. 'Necessary' is adjective, 'necessity' is noun, and 'unnecessarily' is negative adverb. The sentence needs an adverb to modify 'taste' as a verb.

Polite requests and permissions: 'Could' is the past form of 'can' and expresses politeness in questions. 'Would' expresses hypothetical situations but not permission/capability. 'Can' is too direct, and 'will' is incorrect for asking permission in this context. 'Could' is the most appropriate for seeking permission politely.

'Matrimonial bureau' is the standard term for agencies that arrange marriages. 'Office' is too generic, 'affair' means romantic relationship or event, and 'enterprise' is too broad. 'Bureau' specifically refers to an office or agency providing a service, which matches the context of marriage matchmaking.

Past simple tense describes completed actions. 'Went' is the past tense of 'go'. 'Was went' is grammatically incorrect (passive auxiliary used intransitively), 'gone' is past participle requiring 'have', and 'go' is present tense. Despite the heat being a barrier, he completed the action of going out.

Adjectives describe nouns. 'Beneficial' means producing good or helpful results. 'Benefit' is noun or verb, 'beneficent' means doing good or charitable (applied to people), and 'benefited' is past tense verb. The sentence needs an adjective to modify 'fresh air'.