He will stop showing off, if no notice _________of him.
| A．is taken | B．will be taken | C．takes | D．has taken |
They have been waiting for many hours to see the singer, but the airplane must have been _____.
| A．behind the times | B．behind schedule | C．ahead of time | D．in no time |
The _____ of the trees in the water was very clear.
| A．mirror | B．sight | C．reflection | D．shadow |
Today, housework has been made much easier by electrical _____.
| A．facilities | B．appliances | C．instruments | D．equipment |
Pack the cake in a strong box, or it might get _____ in the post.
| A．splashed | B．spilt | C．crushed | D．crashed |
Professor Smith and Professor Brown will _____ in giving the class lectures.
| A．exchange | B．alter | C．shift | D．alternate |