根据句意，用所给单词的适当形式填空。(每空不限一词)
1. It’s _______________ (polite) to ask a lady about her age in western countries.
2. France is a beautiful country and ______________ (cover) an area of over 260,000 square miles.
3. The mother advised his son not ____________ (stay) up late to finish homework.
4. Our classroom is much brighter than ____________ (they).
5. If you use binoculars, you can watch the stars in the sky even (clear).
6. It is never too old to learn, Karl Marx began to learn English in his ___________ (fifty).
7. There used to _____________ (be) a big tall tree in front of the classroom.
8. Mary ______________ (talk) on the phone, so I just nodded to her and went away.
9. The bags are for those ____________ (tour). We should give them back.
10. It’s reported that soccer ___________(teach) in schools in our country and the first soccer textbooks will be in the students’ hands soon.
1. impolite 2. covers 3. to stay 4. theirs 5. more clearly
6. fifties 7. be 8. was talking 9. tourists 10. will be taught