What makes him so upset?
When everybody was listening carefully, the noise of several people fighting outside____ the professor’s speech.
____ the chance, otherwise you’ll regret it.
People who can’t ____between colours are said to be colour -blind.
Would it be____ for you to pick me up at four o’clock and take me to the airport?
After the successful launching of the Shenzhou 9, ______ the astronauts will work and live in Tiangong-1— the space lab module is ______ the whole nation care about.