It takes about twelve minutes    and five minutes by bike.

I forgot      the key with me,so I can not open the door.

_ _What are you going to do this afternoon?
_ _My hair is too long. I want to get my hair__________.

Peter is made_______ his room once a week.
A. clean              B. to clean           C. cleaning

There are several chemical factories ______ waste water into the river.
A. pours       B. pour           C. pouring

---Do you have any problems ______ your business?
---No．thank you very much．

--How did you help him ___over the difficulties?
--I made it by_______ him never to give up.

When I got out of the room, I found someone _____________ the tree.

I have to work hard _____ the test.

---Hi. Lucy! What’s wrong with you? You look so worried.
---I have many problems to solve, but I don’t know ___________ first.