He is the most excellent student, ______who always helps others.

   A. the one                B. one                   C. that                  D. a one

 I walked up to the top of the hill with my friend, ________we enjoyed a splendid view of the lake.                    

A. which                      B. where                C. who                   D. that

---Kate, look after your younger brother this afternoon.

---________? Isn’t he old enough to look after himself? He’s twelve years old now.

　　　 A. May I B. Can I C. Must I D. Should I

House prices vary from place to place and are usually high ________ there are famous schools. 

A. where            B. since                C. when             D. whether

Many people believe we are heading for environmental disaster ________ we basically change the way we live.

A. but                          B. although                   C. unless                      D. if

--- Can I look at the menu for a few more minutes before I order?

--- Of course. ________, Sir.

A. Make yourself at home　　 　　　　　　　　　　　　 B. At your service

C. Take your time　　　　　 　　　　　　　　　　　 D. It doesn’t matter

The lazy girl is dreaming of marrying a millionaire and ________ won’t do any work.

A. anyhow               B. somehow              C. therefore             D. otherwise

 ---Helen sat up late watching TV.

---No wonder ________ she looks so tired.

A. what                        B. that                          C. whether                   D. when

 Why ________ to go abroad to study when there are so many good universities at home?

A. imagine                  B. bother               C. consider              D. prevent

---I'm trying to find yesterday's newspaper. Have you seen it?

---I'm afraid that I ________ it away. I thought you had finished reading it.

       A. threw                  B. had thrown           C. throw                   D. will throw