Please turn off the stove. The water.... for more than fifteen minutes.
A.is boiling
B.was boiling
C.has been boiling
D.will be boiling

In the 19th century, it.... two or three months to cross North America by covered wagon. The trip.... very rough and often dangerous.
A.took / was
B.
had taken / had been
C.took / had been
D.had taken / was

Listen! Mr. Jones.... the piano. You.... noise.
A.is playing / should not make
B.plays / will not make
C.has played / do not make
D.played / would not make

Right now, Long…. with his friends. They.... the differences between British English and American English.
A.sits / discuss
B.has been sitting / will discuss
C.was sitting / was discussing
D.is sitting / are discussing

- ....free this afternoon?
- No, I.....
- What....? -....
- I.... my dentist.
A.Will you be / will not / have you done / have seen
B.Have you been / have not / will you do / will see
C.Are you / am not / do you do / see
D.Are you / am not / are you doing / am seeing

Listen! Someone .... at the door. I .... it.
A.knocks / answer
B.has knocked / will be answering
C.was knocking / answered
D.is knocking / will answer

Every day, John…. rice and vegetables for lunch, but today he…. chicken soup and roast beef. Today is his brother’s wedding.
A.has / is having
B.has / has had
C.is having / has
D.has had / has

It.... , so we can’t go to the beach.
A.had rained
B.rained
C.is raining
D.will have rained

I am sorry I cannot hear what you.... because everybody.... so loudly.
A.are saying / will talk
B.were saying / has talked
C.have just said / is talking
D.said / was talking

Usually, Mr. Pile ... us Physics but today he .... ill so Mrs. Young.... us.
A.teaches / is / is teaching
B.has taught / is / teaches
C.is teaching / has been / teaches
D.taught / was / was teaching