— Is Alice your sister? —Yes, .
-Can you show me _______ to use this kind of camera?-Sorry, I don't know, _______.
The purpose of new inventions is _______ life more difficult, but to make it easier.
-Have you got any books on English grammar? I want to borrow _______.-Yes, here you are. But you must return it by Friday.
-My father with my grandparents _______ Shanghai.-Really? _______ will they come back?
-Your mother _______ take a bus to work?-Yes. But now she usually goes to work on foot.