按要求完成句子。
1．There is an apple in the basket. （改为复数句）
There _____ some _______ in the basket.
2．There is some chocolate on the plate. （改为一般疑问句）
_____ there ______ chocolate on the plate?
3．There are lots of tigers in the zoo. （改为一般过去时）
_________ _________ lots of tigers in the zoo。
4．There is a book in my bag. There is a pencil-case in my bag, too. （合并为一句话）
_______ ________ a book and a pen-case in my bag.
5．There were some men in the shop. （改为否定句）
There ________ ________ men in the shop.
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