Great changes ______ in China in the past 20 years.
| A．took place | B．have taken place | C．were taken place | D．have been taken place |
When the group discussion is nearing its end，make sure to ________ it with important points.
| A．conclude | B．lead |
| C．avoid | D．hold |
If you are in trouble，Mike is always willing to ________a hand.
| A．lend | B．shake |
| C．wave | D．want |
The watch was very good，and he ________ 20 percent down for it.
| A．paid | B．cost |
| C．bought | D．spent |
Try not to cough more than you can________since it may cause problems to your lungs.
| A．check | B．allow |
| C．stop | D．help |
David is ________ animal fur，so he won’t visit anyone who has cats or dogs in the house.
| A．curious about | B．allergic to |
| C．satisfied with | D．fond of |