Who’s ________ speaking—-_________Amy.

I usually go shopping in that supermarket,because their prices are _____.

Look at this picture. There is a bridge_______ the river, and there are three birds_______ the tree.

They’re arguing on who, on earth, is known for the great discovery penicillin, an effective bacteria killer.

Alice, you got an A in this science exam.—__________________.You know I am not good at it.