The Olympic Games ____ held every ____ years.
A.is;four | B.are;four | C.is;five | D.are;five |
A chemical works____ built there.
A.is to being | B.have been | C.were to | D.has been |
Chairman Mao' s works ____ published.
A.has been | B.have been | C.was | D.is |
The Arabian Nights ____ well known to the English.
A.is | B.are | C.was | D.were |
The number of deer, mountain lions and wild roses ____ much if people leave things as they are.
A.doesn' t change | B.don't change | C.change | D.changed |