There are five pairs, but I'm at a loss which _____ to buy.
| A．to be chosen | B．to choose from | C．to choose | D．for choosing |
While looking for some personal documents, I happened to see an album __________some old photographs.
| A．contained | B．to contain |
| C．containing | D．being contained |
It is more important than ever to develop one’s maths, science and computer skills _______technological change is accelerating.
| A．though | B．unless | C．until | D．because |
_______ patient when you argue with someone who is not so reasonable.
| A．Be | B．Being | C．To be | D．Having been |
What’s up, Bill? You __________upset.
| A．look | B．looked | C．have looked | D．had looked |
—Edith, would you mind my opening the door?
—_______. I’m feeling rather cold.
| A．That’s all right | B．Good idea |
| C．You’d better not | D．Not at all |