My brother is studying in ______ university in America; he wants to be ______ astronaut in the future.

Some people said _____ that Copenhagen Conference

No one wants you to be _______ but we really want you to do your best always.

Let’s go hiking ______ staying at home, shall we? — A good idea. [ ]

I’m a little tired. Let’s go to the zoo by taxi. —We ________take a taxi. It’s not far from here.