I wonder how much you charge for your services.—The first two are free _____ the third costs $30.

The number of the giant pandas in China is getting _________, but the red-crowned cranes are ___________.

Do you know where David is? I couldn’t find him anywhere. – Well. He _____ have gone far — his glasses are still here.

urn to the problem of water pollution , I’d like you to look at a study _______ in Australia in 2012.

There are 30 people________in the traffic accident butthe injured ________ rescued at once.