【推荐1】Don’t cut in while others are speaking. It is very ________ (polite).

【推荐2】It is ________ (polite) to speak when eating things.

【推荐3】It is i________ to make fun of someone’s appearance.

【推荐1】Is it important for us students________ (learn) English well?

【推荐2】It's ________ (不可能的) to finish all the work in one hour.

【推荐3】It’s difficult ___________ (cook) something to eat on this kind of journey.

【推荐1】用所给词的适当形式完成句子
1. A helmet can protect us from____ (hurt) when we are riding a bike.
2. ______ (remember) to keep in touch!
3. There ____ (be) plenty of grass on the ground.
4. He always does what he can ____(save) others.
5. It is____ (danger) to play football on the street.

【推荐2】I don’t like the steamed fish. It’s too ________ (salt).

【推荐3】I’m s________ I can’t go to your party.