It is__________ his advice on how ___________English well_________ you a lot of trouble.[ ]

You must be careful when ___ on the highway.

The students didn`t find much______ about the topic on the website.

Persons under 16 ______ not be employed in our country．

What sort of friend do you want to have? Someone beautiful?—Well, it _____ be beautiful ? that’s not important.[ ]