—Hello！I want to book a double room.
—Sorry.There is no double room ________.

The system has been designed to give students quick and easy ________ to the digital resources of the library.

Hiking by oneself can be fun and good for health.It may also be good for ________ building.

Last year the number of students who graduated with a driving licence reached 200,000，a(n) ____________ of 40,000 per year.

Teachers have to constantly update their knowledge in order to maintain their professional ________.　　　　　　　　　　　　　　　　　　

The group’s research has done much to      our knowledge of the HIV virus．

----Have you read the paper?
----Yes, but I don’t think there is _______ new in it.

The box ______ a lot of coins, ______ an old Chinese one.

—Sorry, I am late.
—That’s OK. You are here, that’s what _____

The ________ on driving after drinking alcohol is being carried out all over the country, which is helpful to reduce traffic accidents.