作业帮九上英语改句子6-8 和英译汉1-5
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九上英语改句子6-8 和英译汉1-5
九上英语改句子6-8 和英译汉1-5 
九上英语改句子6-8 和英译汉1-5
6.are planted
7.is used for
8.was,brought
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When was,invented
is used for
have those things
was hard
was invented
6. are planted 7. is used for 8. was bought When was invented is used for have those things was difficult was invented