用所给单词的适当形式填空。
1. The boy often (throw) rubbish on the ground.
2. We should (keep) our city clean.
3. She (come) to school by metro every day.
4. Don’t (park) your car here, Sir.
5. Look, the man ______________ (water) the flowers in the garden.
6. The sign on the wall ___________ (mean) “Danger”.
7. The floor is wet. You shouldn’t _________(run) here.
8. Shall we ___________(pick) up the banana skin now?
9. Would you like _____________(move) these desks away from the room ?
10. People can _________(plant) trees to keep the city clean.
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