Parents often advise their children to study hard in the hope that they will ______ success in the future. 

A. The workers at the factory shouldn’t wear protective clothing.

B. The workers at the factory must wear protective clothing.

C. The workers at the factory needn’t wear protective clothing.

D. The workers at the factory may wear protective clothing. 

A. with

A. Such a difficult test is it that they couldn’t do it well.

B. The test is so difficult that they couldn’t do it well.

C. So difficult was the test that they couldn’t do it well.

D. It was such the difficult test that they couldn’t do it well. 

A. It’s my pleasure.

B. Oh yes, it’s very unfashionable.

C. Thanks. It’s very kind of you to say so.

A. As soon as it stops raining

B. After it had stopped raining

C. When it stopped raining

A. So long as you pay all the bills at once, you can stay in the flat longer.

B. Whether you pay all the bills at once or stay in the flat longer.

C. Without all the bills paid, you can stay in the flat longer.

D. Unless the flat is free of bills, you cannot stay in it.