Read the passage carefully and then choose the best answer for each blank

A. in

B. on

C. from

D. over

A. covered

B. covering

C. cover

D. to cover

A. them are

B. its

C. it is

D. it’s

A. in

B. for

C. to

D. by

A. moving

B. to move

C. move

D. moved

A. on

B. in

C. within

D. for

A. must

B. should

C. have

D. would

A. describing

B. describes

C. described

D. to describe