Q

A

Explanation

Skill tested

17

A

The answers “ promptly”, “immediately” and “instantly” means “ very quickly” which does not fit the context. Only option A fits into the sentence

Context

18

C

When we see the adverb of time ‘today’, we have to use present tense.

Present tense

19

D

‘At odds’ indicates Russian scientists’ action is in contrast with the accepted standards

Context

20

B

 The answer A, C and D do not suit the context. Only “standard” shows the expectation of the world on the safety of nuclear waste disposal.

Context

21

B

‘Contrary to’ means the nuclear disposal is at odds with the global standards.

Context

22

A

Since the radioactive injections may haunt the planet for centuries, environmentalists have debate over the disposal.

Context

23

D

‘ Violates’ is the best option since it means that the practice is in contrary to a rule.

Context

24

A

‘Thousands of  years’ forms a noun phrase.

Usage

25

D

Waste is being injected, not inject itself under the layers

Passive voice

26

D

Only “potential” shows the meaning of possibilities and suit the context of the sentence.  

Context

28

C

Long way suggests far from doing something.

Common expression

29

D

“That” is a pronoun, referring to the question raised by top US Energy Department official.

Pronoun

30

C

Only answer C forms a superlative adjective

Part of speech

31

B

The definite article has to put in front of  “ Earths’ environment”.  There is only one Earth. Thus, we need an article ‘the’.

Article and possessive adjective

32

D

When we see ‘far and away’ we have to use present perfect tense.

Tense

33

C

Relating to somebody’s role, status or position

Preposition

34

A

‘Learn of’ means to be aware of something or realize something. “Learned of” has a similar meaning to “heard of”.

Phrasal verb

35

B

“Repeated” collocates with “efforts”

Collocation