16. He made another wonderful discovery, __________ of great importance to science.
| A．I think which is | B．which I think it is | C．which I think it | D．which I think is |
______ team wins on Saturday will go through to the national championships.
| A．No matter what | B．No matter which |
| C．Whatever | D．Whichever |
—Catherine, I have cleaned the room for you.
—Thanks. You ______ it. I could manage it myself.
| A．needn't do | B．needn't have done |
| C．mustn't do | D．shouldn't have done |
This is the store ______ we visited the famous shop assistants.
| A．where | B．there | C．that | D．which |
The gentleman ______ you told me yesterday proved to be a thief.
| A．who | B．about whom | C．whom | D．with whom |
It was ______ computer games that cost the boy a lot of time that he ought to have spent on his lessons.
| A．to have played | B．playing |
| C．played | D．having played |