You can see an________in the zoo.
-Which one do you want to buy, an iPhone 4, an iPhone 4S or an iPhone 5S? -___________. They are too expensive.
They will protect their families if there is ____________.
The little girl kept ________ the house, because she wanted to keep it _________.
I don’t think Jim can _______ a picture on his bedroom wall because he is so short.
________the teachers in our school is 150 and some of them are_______ teachers.