—You have written your book report _____ one hour. Have you finished it?—Not yet! But I think it is due _____ one hour.
As the world’s population _____ becoming ______, we have to do something to change the situation.
---I think Mountain Emei is more beautiful than ___________ mountain in China. ---Really? I want to go there then.
I know people in Austria speak ________. So they don’t have any trouble communicating with _________.
Lucy ___________ Tom since last year. And they have had a good life so far.
The hard-working ___________ those who work a lot on study.