1. Learning history well is i _______ to all of the Chinese students. So we must work hard.
2. Cabbages are good for our ________ (health). We need to eat them three times a week.
3. Each of the students exercises ________ (two) a day in the school.
4. He ate ________ (少) fruits than us, so he is not strong.
5. Don’t ________ (触摸) the light. It’s very dangerous.
