Being a parent is not always easy, and being the parent of a child with special needs often carries with___ extra stress.

Never give up your effort, ______ you are sure to get what you’re trying to get

We have already placed an order ____that company _____ the machines.

At least 300 million people areusing QQ_____ by Ma Huateng to chat online.

Tom hid himself behind the door, _____ he could hear the steps of his mother clearly.[ ]