Choose the correct answer that complete these given words.

Laser / device / concentrate / light waves / intense beam.

A. Had the letters typed

B. Have the letters typed

C. Have the letters been typed

D. Have been the letters typed

A. they keep the users alert all the time

B. they are indispensable in everyday communications

C. they make them look more stylish

D. they cannot be replaced by regular phones

A. would be

B. was

C. had been

D. were

A. which

B. what

C. when

D. where

A. have lost / left

B. have lost / leave

C. lost / have left

D. were losing / had left

A. didn’t bring

B. wouldn’t have brought

C. hadn’t brought

D. won’t bring

A. applied/ had asked

B. applied/ asked

C. had applied/ asked

D. applied/ have asked