The couple is considering     a 3D TV set for their new flat, which is widely considered to be in fashion．

The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.

 It is good ______ for an Arab to stand ______ to his friend when they are talking.

_______ in the storybook that he had bought not long before, the boy didn’t notice his mother go into his room.

The question is very important. It really needs _______.