14. This is an orange.(改为复数句)
____ ____ oranges.
15. Are you from China?(作肯定回答)
____, I ____.
16. Those are books (改成单数
____ ____ a book.
17. These are desks in English.(对画线部分提问)
____ ____ these in English?
18. He is in Grade Seven.(改为一般疑问句)
____ ____ in Grade Seven?
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