.I recommended _____ an English-English dictionary, which I thought would be of great help to her studies.
| A．buying | B．bought | C．to buy | D．he bought |
While reading, you'd better make a mark ___ you have any questions.
| A．on which | B．at where | C．the place where | D．where |
Don't keep your mouth ___ if you want to improve your spoken English.
| A．shut | B．shutting | C．shutted | D．to shut |
My classmates, Li Ming, was highly praised for ___ a good deed.
| A．doing | B．have done | C．having done | D．being done |
There are many pine trees on ___ of the street.
| A．every side | B．neither side | C．both side | D．either side |
I don't think this question is worthy ____.
| A．to consider | B．to be considered | C．considering | D．of considering |