lota of we have got in china tall buildings怎么改

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• 一、判断下列句子是否含有现在完成时1 I have answered the question.( )2 The police knew the truth.( )3 Computer has helped human beings a lot.( )4 The little boys have drunk 200 ml of milk.( )5 We kept in touch with each other by email.( )6 The students have drawn many beautiful pictures.( )7 Sally has left for Beijing.( )8 I have studied English for 10years.( )9 The workers built many tall buildings.( )10 Your siser has got five prizes.( )二、把上面含有现在完成时的句子变否定句,一般疑问句并回答
• 把下列句子改为被动语态.1、They have built many tall buildings .Many tall buildings ____ ____ ____ .2、You must hand in your history homework by the weekend .Your history homework ____ ____ ____ ____ by the weekend .3、Last Sunday we heard them sing Beijing Opera in the theater .They ____ ____ ____ ____ Beijing Opera in the theater last Sunday .4、You should water the flowers once a day .The flowers ____ ____ _____ once a day .5、Do people grow rice in North China ___
• lota of we have got in china tall buildings怎么改
• 若多项式2（x²-3xy-y²）-（x²-3mxy+2y²）中不含xy项,则m等于（ ）若多项式2（x²-3xy-y²）-（x²-3mxy+2y²）中不含xy项,则m等于（ ）
• fell on the ground、fell to the ground和fell onto the ground有什么不同?最好有例句,