Elephants have their own way to tell the shape of an object and____it is rough or smooth.[ ]

If(如果) you’re new in a bigcity, you cana policemanfor help.

Can you take _____ things to your sister — Yes.

He is very tired working all day. Don’t ________ him waiting outside in the rain any longer.

More teens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.