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We should ________ waste paper ________ cut down any trees.

A. either – or

B. either – nor

C. neither – nor

D. neither – or

“Where did he go?”

-He asked where he _____

A. had gone

B. has gone

C. went

D. have gone

The boy is smart. He learns ________.

A. faster

B. fastest

C. fast

3-D printing ____ complex tools and components.

A. is used for produce    

B. is used to produce    

C. uses for producing

D. uses to produce