挑选出来的易错题目,请您给予具体解析,

My parents sent me a birthday present(保持句意不变)
My parents sent a birthday present______    ___________

It will take him an hour to finish his homework today(保持句意不变)

      He _______     ________  an hour _________his homework today.
3.Mr.Li got to Beijing yesterday afternoon (保持句意不变)
   Mr.Li ________    _______Beijing yesterday afternoon
  Mr.Li__________Beijing yesterday afternoon
4.All the  children enjoyed  themselves  in the park.(保持句意不变)
  All the  children ________    ________    _________    ________in the park
5.The Li family has come back from Beijing  .(保持句意不变)
  The Li family________   __________ from Beijing 
6.We are going to visit   （__the  Summer   Palace__） (划线部分提问)
  _____    ______are we going to _________?