_______ he can’t answer the question, you’d better ask someone else.

A. Since           B. Though            C. Before         D. Whenever

— Mum, why don’t you have the robot ______ housework for you?

— Oh, it has caught a virus. I should have it _______ at once.

A. done, repaired      B. done, repair

C. do, repaired        D. do, repair

When high buildings are ________ here and there, there will be less and less land ________.

A. rising, leaving       B. rising, left

C. raising, leaving      D. raising, left

The Smiths are considering ________ to England because they ______ the cold weather there.

A. not moving, aren’t used to

B. not moving, didn’t use to

C. not to move, didn’t use to

D. not to move, aren’t used to

Yixing is known _______ the people in China _______ the Land of Fish and Rice.

A. for, as          B. to, as             C. to, for           D. as, for

Someone is knocking at the door. Please go and see ____________.

A. who it is         B. who is he

C. who he is       D. who is it

Yuan Longping has devoted all his life _______ the research and the _______ of the rice plants.

A. on, development    B. to, development

C. to, developing    D. on, developing

Though they are _______ little children, they have worked out _______ many difficult math problems.

A. so, so             B. such, such

C. so, such          D. such, so

________ of the students in our class ________ interested in WeChat on the Internet.

A. Two-fifths, is       B. Two-fives, is

C. Two-fifth, are      D. Two-fifths, are

Marie Curie also ________ the use of X-ray machines, ________ now widely used in hospitals.

A. pushed for, which is   B. pushed out, which are

C. pushed for, which are   D. pushed in, which is