Not many students could work out how the machine operated.

• D. out

With no exception, concentration is the key factor to success in taking a test.

• A. With

Human beings are proud of their scientific achievements.

• C. of

I really can't come up with any ideas to deal with the problem.

• B. up with

Linda is looking forward to her study abroad.

• D. to

The students are encouraged to take part in the charity.

• D. encouraged

The support was redundant and we had to ask for more help from other people.

• A. redundant

On the occasion of New Year, we wish you good health and prosperity.

• C. occasion

Biology is a science of natural laws affecting every object on the earth.

• D. Biology

The fire broke out and spread quickly because of the wind.

• D. broke out

Taking photos is one of the most popular hobbies.

• A. taking

She promises a(n) reward for anyone who finds her laptop.

• C. reward

The minority disapproved of the plan. It was finally cancelled.

• C. minority

The students were active. They took up different sports and hobbies.

• D. took

Please, go to the lost and found to look for your hand luggage.

• A. lost and found

But for the teacher's help, she wouldn't have solved the problem.

• B. wouldn't have solved

This is Mr. Black, whose works are famous in the field of genetics.

• D. whose

I'm sorry but I don't remember writing anything to her. You may be mistaken.

• A. writing

She had changed so much that no one hardly recognized her.

• B. hardly

The man is said to be the most efficient worker in the factory now.

• A. to be

He'd better look for a different job, hadn't he?

• B. hadn't