Since Tom ______ downloaded a virus into his computer, he can not open the file now.
| A．readily | B．horribly | C．accidentally | D．irregularly |
While reading, you’d better make a mark ___ you have any questions.
| A．on which | B．at which | 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 classmate, Li Ming, was highly praised for ___ a good deed.
| A．doing | B．have done | C．having done | D．being done |
Sunglasses can ___ us from strong sunlight.
A. hold B. prevent C. protect D, make
There are many pine trees on ___ of the street.
| A．every side | B．neither side | C．both side | D．either side |