To make our neighborhood more beautiful, we needn‘t do much more than make a little__

Do you know what___so much greenhouse gases in the air?

A. producing

B. has produced

C. will produce

D. produces

When you visit the room, the electronic facilities in it can___and recognize you.

A. interview

B. identify

C. instruct

D. introduce

You___have come to the concert. It was excellent.

A. may

B. need

C. ought to

D. must

in the last twenty years.

A. takes

B. took

C. have taken

D. should taken

It will not be long before everyone___the importance of computer skills at work.

A. will see

B. have seen

C. sees

D. would see

The problem of global warming___for decades.

A. has been existed

B. has existing

C. being existed

D. has existed

Lowering personal production of waste___everyone over the past decade.

A. benefited

B. has benefited

C. benefits

D. benefiting

Let everybody___something to reduce environmental pollution.

A. do

B. to do

C. doing

D. do it

ng carbon footprints.

A. will often see

B. often see

C. are often seeing

D. have often seen

___good care, the electrical devices in the area all work well.

A. Regarding

B. Thanks to

C. Like

D. Thanks for