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A. would

B. should

C. must

D. will

A. will

B. must

C. should

D. would

A. for

B. into

C. in

D. to

A. resource

B. energy

C. existence

D. biodiversity

A. by

B. against

C. for

D. with

A. polluted

B. polluting

C. pollute

D. pollution

A. didn’t see

B. don’t see

C. haven’t seen

D. hasn’t seen

A. resurface

B. flat

C. surface

D. face

A. had

B. had have

C. have had

D. had had