用所给动词的正确形式填空（10分）
1. We know the earth (travel) around the sun.
2. Can you see the students (plant) trees on the hill now?
3. ---Where’s your father? ---He (clean) the car behind the house.
4. I am sure she (be) a very good teacher in a few years.
5. He wanted my help. So I stopped (help) him.
6. Was Jane very busy (plan) a boat trip with you last night?
7. It is very important (not give) your goldfish too much food.
8. The boss usually makes his workers (work) for twelve hours every day.
9. David (fall) off the tree and hurt his legs a moment ago.
10. Millie, (not frighten) the dog, or it will bark at you. 1. travels 2. planting 3. is cleaning 4.will be 5.to help
网友回答
(答案→)1. travels 2. planting 3. is cleaning 4.will be 5.to help
解析：
1.表示客观的真理用一般现在时，主语为单数第三人称地球，后面的谓语动词travel要用第三人称单数形式travels。
2.本题的含义是现在你能看到学生在山上植树吗？看到某人正在做某事可用see sb doing sth，故空格填plant的现在分词planting。
3.问某人在哪里，某人应该正在做某事，故用现在进行时，结构为be+现在分词，故填is cleaning。
4.in a few years通常用于将来时，故使用be的将来结构will be。
5.本题的含义是他想要我的帮助，所以我停下来去帮助他，表示停下来做另一件事应说stop to do，故填to help。
6.表示忙于做某事通常说be busy （in）doing sth，故填planning。
7.本题的it是形式主语，真正的主语位于句尾，用动词不定式to do，否定形式是not to do，故本空填not to give。
8.使役动词make后应跟动词原形作补语，故本空还是填work。
9.本题中有个过去的时间短语a moment ago，故本题使用过去时，fall的过去式为fell，故空格填fell。
10.本题为祈使句，它的否定形式为don’t+动词原形，故本空应该填don’t frighten。