I am so glad that I have found the same modern computer ____ I am working on.
| A．which | B．as | C．that | D．where |
She brought with her three friends, none of I had ever met before.
| A．them | B．who | C．whom | D．these |
We wonder ___________ quite a number of living things are dying out.
| A．that | B．as | C．why | D．when |
He was so busy that he couldn’t help ____________ the experiment.
| A．doing | B．do | C．did | D．done |
After he ________ the golf club, he has ________ a number of competitions.
| A．took part in; taken part in | B．joined; taken part in |
| C．joined in; joined in | D．joined; joined |
My uncle’s house is much smaller than ours, but it is twice expensive.
| A．as | B．so | C．too | D．very |