He has been the computer for two hours, chatting with a boy from Australia.
| A．in | B．on | C．at | D．by |
– I am afraid I can’t return the camera to you before Friday.
– ____.
| A．Not at all | B．Be careful | C．Take your time | D．Don’t be afraid |
1. shade A. behave B. shadow C. considerate D. battle
2. crowd A. slow B. window C. allowD. row
3. actor A. worth B. therefore C. export D. doctor
4. reduce A. chemical B. regretC. generationD. intend
5. nutrition A. struggleB. support C. summaryD. confuse
Everyone, please remain ____ until the plane has come to a complete stop.
| A．seat | B．seated | C．seating | D．to seat |
I still remember ____ to the Summer Palace and what I saw there.
| A．taking | B．to take | C．to be taken | D．being taken |
Most birds find it __
__ to sleep in the trees.
| A．was safe | B．safe | C．to be safe | D．being safe |