所给单词的正确形式填空。
1. My mother is a bus _____ (drive).
2. — How many _____ (tomato) can you see?
    — I can see four.
3. Mr. White goes _____ (shop) every morning.
4. What are you going to _____ (be) when you grow up?
5. Betty often _____ (wash) her dress on Sunday.

【考点】单数名词,复数名词,系动词,一般现在时，动词单数第三人称,动名词

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