Measles ........... proven to be caused by a kind of virus.

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

Cattle ........... raised mostly in the south of the United States.

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

Billiards ........... considered to be an artistic sport.

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

My mother told me she _______ very tired since she came back from a visit to our grandparents.

A. was

B. had been

C. is

D. has been

The director  _______ for the meeting by the time I got to his office.

A. left

B. had left

C. leaves

D. will leave

By the end of lasomething summer, the farmers _______ all the crop.

A. harve some thinged

B. had harve some thinged

C. harvesomething

D. are harve some thinged

When we went back to the booksomethingore, the bookseller _______ the book we wanted.

A. sold

B. had sold

C. sells

D. has sold

It is possible that she will come to our party tonight. She______ come here tonight.

A. need

B. may

C. should

D. will

It is possible that she will come to our party tonight. She______ come here tonight.

A. need

B. may

C. should

D. will

You have been reading for four hours. This book ___ be very interesting.

A. can B. might C. must D. should