Nick, it’s good for you to read some books ________ China before you start your trip there.[ ]

We some robots at home in the future， and there some in the office， too.

In no city of China _____ little about the economic development．

How do you usually go to work–I usually drive，but if it is fine，I ______ by bike

We should _______ the old and offer our seats to them on buses.