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The present perfect continuous tense is also used to describe actions in the past that have recently stopped. 

'Could' is used to talk about theoretical possiblity also.

 The future continuous tense (be coming) is preferred to the present tense (come)  when you want to learn about somebody's intentions.

The sentence implies that something that has happened is lucky for Ramesh. Therefore, we will use the past tense 'was situated'.

Am is always used with I, so, is the correct answer.

'Was heralded' is followed by 'by'.

 'Had left' is used as the past perfect tense and is used for the event that happened before 'he told them'.

The sentence implies that an action was taking place or had taken place by the time the second event took place. The option ' was singing' implies that this action was taking place when 'the wife came home'.

'Has rung' is an example of the present perfect tense, which indicates event that have happened in the past.

 The present perfect continuous tense is used to refer to events that started in the past and has continued up until now. In this case, the event is 'rain'.

 'Was barking' implies a continuous action in the past. 

 'Had killed' is the past perfect tense.

 'Next' implies in the future, hence, the future tense 'Will you have' is used.

 'I' will be followed by 'have not' + the 3rd form of the verb (seen).

 The past tense (aroused) is maintained in the sentence.