The surface of the table ______ smooth enough．
| A．hash’t felt | B．isn’t feeling | C．doesn’t feel | D．isn’t felt |
When _______ comes to advertisements, we must all use our intelligence.
| A．that | B．it | C．there | D．this |
As they were walking around, they noticed a man _______ against a tree.
| A．sit | B．to sit | C．sitting | D．Sat |
Today, when scientists examine mummies, they wear special clothing for protection _____ they breathe in harmful gas.
| A．even though | B．in case | C．until | D．unless |
Wow! That’s Uncle Sam. Now he’s in Paris, _____ he?
| A．isn’t | B．hasn’t | C．doesn’t | D．wasn’t |
When _____ what is most important in life, some choose money, ____ others choose friendship.
| A．to decide; and | B．to decide; because |
| C．deciding; / | D．deciding; while |