—Which one do you want to buy, an iPod touch 4, an iPad 3 or an iPhone 5?—______. They are too expensive.
Tom usually gets up _____ half past six _____ Saturday morning.
Mr Green is our new teacher this term. He teaches _____ history.
We must protect (保护) animals like elephants, because they’re _____.
There are _____ teachers in our school.
When we go to the library, we must be _____ in the library.