Tom seldom _________, because he has lots of Maths _________ to do.
| A．exercise ; exercises |
| B．exercise ; exercise |
| C．exercises ; exercise |
| D．exercises ; exercises |
I spend some timeEnglish books every morning.
| A．reading | B．in read |
| C．to read | D．reading |
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 |