The_______waiter came up to us and said,"You are welcome."
| A．smiling | B．smiled | C．smile | D．to smile |
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；/ |