The passage mainly wants to tell us ______.
A．it is difficult for a commuter to go to work
B．we had better not go to work by train
C．it is necessary to improve the poor conditions on railway
D．both A and B

A．To help the students from the same countries overcome their homesickness and other problems.
B．To set up booths decorated with pictures and things of interest in the respective countries.
C．To recruit anyone who can see to help make costumes so that every club member can wear their national costume.
D．To teach the American students Scottish and Irish folk dances during the special event of the display.

As required by the law, you must stop after an accident, if __ .
A．you have been injured by somebody
B．your car has been damaged
C．you have injured somebody else
D．you have witnessed the accident

It is reported that the police __ the case.
A．is looking on
B．are looking into
C．is looking after
D．are looking up

According to the passage, what will add to water shortage？
A．Oil scarcity.
B．A drop in temperature
C．A growing population.
D．Reduced food supply

The average speed of a ball hit by a Pingpang racquet （球拍) is the __ among all ball games.
A．lowest
B．highest
C．quickest
D．most full