No one knows when such a custom first           ．

A．came into power                                               B．came into being 

C．came true                                                         D．came out

The road         and it will be finished by the end of next year．

A．is built                                                             B．is being built   

C．has been built                                                   D．was built

The company was willing to provide us with what we needed，       made us excited．

    A．what                   B．when                   C．which                    D．where

―John，which color do you like，red or blue?

―         ．I prefer to buy a yellow one．

      A．Either                 B．Both                    C．Neither                  D．All

The farmers use dogs to         their cows at night．

    A．take care              B．1ook up               C．watch over             D．turn to

―Would you like to come to my house for dinner tonight?

―          ，but I’m too busy．

       A．I’d like to                                                 B．I don’t like to   

       C．Never mind                                                 D．Good luck

        a study，people who often stay up too late are more likely to die of heart disease．

A．With the help of                            B．Because of   

C．According to                                D．As a result

We should pay more attention to         education，especially in the west of China．

A．develop                                                         B．developing   

C．developed                                                      D．develops

He is         busy with the work that he has no time to visit his parents．

      A．too                      B．very                    C．such                      D．so

―Do you know what the letters PRC           ?

―Sorry，I don’t know．

       A．stand up              B．stand by               C．stand for                D．stand with