One?third of the area__________covered with green trees.About seventy percent of the trees

__________been planted.?

A.are; have            B.is; has                C.is; have                     D.are; has

The excellent service of the waiters __________highly praised.

That’s why the restaurant is always full of people.?

A.were                  B.are                     C.was                    D.is

I took mathematics and physics because I think that ________ very important for me to make further research in this field.

A.what is                      B.they are                     C.this                           D.which are

He looked quite healthy though he was _________.?

A.in seventy                                      B.in his seventy?

C.at seventies                                     D.at the age of seventy?

There are 2000 boys in this school，and _________them like playing football.?

A.five hundred                                   B.five hundreds?

C.five hundreds of                              D.five hundred of?

.But for the storm,we__________earlier.?

A.should have arrived                         B.arrived?

C.have arrived                                          D.shall arrive?

—My little daughter is coughing worse than ever.?

—She__________to the hospital yesterday.?

A.had to be taken                               B.should have taken?

C.must have been taken                       D.ought to have been taken?

__________he talked about it to reporters surprised me.?

A./                       B.What                 C.That                   D.Whether?

__________leaves the room last ought to turn off the lights.?

A.Anyone             B.The person         C.Whoever           D.Who?

As the plane came down through the clouds，green fields and white houses came into

_________.

A.light                  B.sight                  C.eyes                   D.effect