— I think English is __________ unimportant subject.— I don’t think so. It is __________ useful tool when we talk with foreigners.
— Why do English people talk so often about the weather when they start a conversation?— Because the weather is a __________ subject.
Checking your answers before handing in your paper can help you __________ mistakes.
It’s kind __________ Yao Beina to donate her corneas (眼角膜) _________ three people in need.
Many people do not realize the importance of health __________ they have fallen ill.
Robin broke his left leg in the basketball match last week, since then he __________ in bed.