He didn’t come to school yesterday, did he — _________.He was ill in bed.

The student’s mind is always _____when he listens to his teacher.

Huge quantities of information ________available onthe internet, but whether the information ________ reliable needs to be furtherproved.

David said he could fix my computer, but Ireally doubt it.—________. He is very good at such sort ofthing.

has been trying to bring its nuclearcrisis under ____ control, but ____ spread of radiation has raised concernsabout the safety of the nuclear energy