English Grammar and Usage

(to bend over somebody) therefore "over " is the correct preposition.

(to gather around something)

(to change from one area to another)

Option (1) and (3) are absurd as they do not make any sense. Options (4) and (5) are grammatically correct but factually word 'molecules' is far more suited in this sentence. Hence, option (2) is the correct answer.

NASA's most important scientific instrument, the Hubble space telescope would begin to fail a few years from now, hence this sentence emphasizes on its need to preserve this instrument. The clue comes from the word 'even', the clause that follows it provides an explanation to the blank. This implies that though tough tasks have to be undertaken, Hubble Telescope has to be preserved. 'Kippered' is to cure (herring, salmon, etc.) by cleaning, salting, and drying or smoking, thus (5) is ruled out. Hence, (4) is the answer.

'Little extra gene material' in the first part of the sentence provides the clue for the second. This implies that in addition to desirable genes, there are many genes with negative effects, so it will advantageous to transfer useful genes with as little extra gene material as possible. 'advantage' and 'deleterious' (harmful) in option (4) fits our prediction, hence the answer.

'Was' rectifies the error of 'were'. 'Innings' is a singular noun and is followed by a singular verb.

The adjective 'derogatory' is followed by the preposition 'to' when indicating something that causes harm or damage to a reputation.

The Great Barrier Reef is a specific, unique geographical feature, so it requires the definite article 'The'.

Geographical regions like 'the Iberian Peninsula' require the definite article 'the', and 'Europe' as a continent does not take an article.

Chemical elements generally do not take a definite or indefinite article when referred to in a general sense. 'Hydrogen' is the correct noun to use as the subject.

The subject is Joan of Arc, who is female. Therefore, the pronoun 'she' must be used in the following clause.

The subject 'pharaohs' is plural. Therefore, the pronoun referring back to them must be the plural 'them'.

The reference is to be of unpleasant or unsightly appearance, as opposed to being beautiful. Awful indicates dreadful and appealing indicates charming. Kind refers to a gentle nature.

Here, seldom is the correct antonym of habitual as it implies something that occurs very rarely or not very often. Chronic implies something that continues to happen, accustomed implies something familiar through use and constant implies something that continues or remains steady.