I have devoted four weekends to writing papers and now I feel I ________a rest.
A．deserve B．preserve C．perceive D．receive
Some people ________cruel experiments on animals ________science.
A．make；by the name of B．carry；in the name of
C．make；in the name of D．carry out；by the name of
—Did you remember to give Mary the money you owed her?
—Yes. I gave it to her ________I saw her.
A．while B．the instant C．suddenly D．once
_____ to finish this composition in such a short time is a mystery.
A．How did he manage B．What did he manage
C．How he managed D．What he managed
Einstein’s most famous theory is ______ we call the Theory of Relativity.
A．what B．that C．which D．why
Not everyone has realized what ________important part the balance of ________nature plays in their life.
A．an；the B．/；the C．an；/ D．the；/
