The fact has worried teachers and parents ________ more and more students have got near-sighted.

109 The information allows businessmen tokeep _____ of their list of goods by showing which items are being sold and howfast they are moving

Look! There are a lot of children onthe playground.

Jack, do you know the answer ______ this question It’s too difficult for me.— Sorry, I don’t know. You can ask Jim for help. He is good at math.

eme, I wonder if you can help me—Sure_______