_____ soldiers and doctors have been in Wenchuan to help the people there.
| A．Thousand of | B．Two thousands |
| C．Thousands of | D．Many thousands of |
I don’t know how ________ commas.
| A．use | B．using | C．used | D．to use |
I have trouble ________ the new words.
| A．memorize | B．to memorize | C．memorizing | D．memorized |
Miss Li regards all her students _______ her children.
| A．as | B．for | C．to | D．with |
__ is really hard __ them to climb Mount Tai.
| A．This, to | B．It, to | C．This, for | D．It, for |
If you don't know the word, you can _____ in the dictionary.
| A．look it after | B．look at it | C．look for it | D．look it up |