The reason _______ matters most in his failing the English test is _______ he pays little attention to sentence structures. 

Whoever does not have a mobile phone must borrow _____ because you will certainly need ____ for the tour.

—Did you enjoy your tour around Beijing， Mr Singh？ —Yes. But I hate 　　　　 when the tour guide held out his left hand to shake hands with me. 

To save class time, our teacher has ________ students do half of the exercise in class and complete the other half for homework.

I’ve just seen no more than one copy of“ Gone with the Wind”in the bookshop opposite. Tom, go and buy ________ back.