He is good _____ mathematics but weak _____ languages.

• A. in, in
• B. at, in (Answer)
• C. in, at
• D. at, at

'Good at' is used for skills or subjects. However, 'weak in' is commonly used for areas of knowledge.

The committee _____ divided on the issue.

• A. were
• B. was (Answer)
• C. are
• D. have

In formal British English, collective nouns like 'committee' take singular verbs when acting as one body.

She looked _____ a ghost when she heard the news.

• A. as
• B. like (Answer)
• C. alike
• D. as if

'Look like' means to resemble. 'As if' is used with a clause: she looked as if she had seen a ghost.

The train leaves _____ 9 o'clock in the morning.

• A. in
• B. on
• C. at (Answer)
• D. by

'At' is used with specific times of the day.

He denied _____ the money from the safe.

• A. to steal
• B. stealing (Answer)
• C. steal
• D. stolen

'Deny' is followed by a gerund (verb+ing), not an infinitive.

She is _____ honest girl that everyone likes her.

• A. so
• B. such a
• C. such an (Answer)
• D. such

'Such an' is used before a singular countable noun beginning with a vowel sound (honest → 'an').

I am looking forward _____ meeting you.

• A. to (Answer)
• B. for
• C. at
• D. of

'Look forward to' is followed by a gerund. 'To' here is a preposition, not part of an infinitive.

The harder you work, _____ you will achieve.

• A. more
• B. the most
• C. the more (Answer)
• D. much more

The 'the...the' structure is used for parallel comparisons: the harder...the more.

He has _____ interest in studies.

• A. a little
• B. few
• C. little (Answer)
• D. a few

'Little' (without 'a') means almost none — a negative idea. 'A little' means some.

The old man _____ not walk without a stick.

• A. may
• B. can
• C. could (Answer)
• D. should

'Could' expresses past ability or inability. The old man was unable to walk without a stick.