Two _____ died of cold in that country last winter.
| A．hundreds old people |
| B．hundreds of old people |
| C．hundred old people |
| D．hundred old peoples |
The experiment shows that proper amounts of exercise ,if _______regularly, can improve our health.
| A．being carried out | B．carrying out | C．carried out | D．to carry out |
It is one of the funniest things ____on the Internet so far this year.
| A．finding | B．being found | C．to find | D．found |
To learn English well, we should find opportunities to hear English_______ as much as we can.
| A．speak | B．speaking | C．spoken | D．to speak |
---You effort is sure to pay __________
---Thank you for you encouragement.
| A．off | B．back | C． for | D．down |
Although he failed when he tried doing the experiment for the first time, he decided to try it____.
| A．once in a while | B．at once | C．once more | D．once |