用括号中所给单词的正确形式填空。His pencil is in the pencil box．This is _________ （I）．
_________ （it）are nice baseballs．
I _________ （be）an English schoolgirl．
This watch is not _________ （your）．
These are _________ （Lily）photos．
Look at the picture! This is my sister and _________ （that）are my brothers．
That _________ （be not）my ruler．
I have some _________ （watch）．
This is _________ （we）room．
Is _________ （his）your father?
People around the world can hardly （避免） buying products made in China.
I often see an old man with （灰色）hair sweeping the road near my school.
Traditional Chinese （药）has been playing an important role in treating COVID﹣19.
Mike often （收集）stamps and plays basketball in his spare time.
The big tree over there is probably one （百）years old.