There’s no doubt _____enough concern must be paid to the problem of the stay­at­home children.

His eyes suddenly widened. I knew a good idea must have _________ to him.

With all these attractions, _____ tourism is increasing wherever there is a Disneyland.

—Do you have any idea what Paul does all day?—As I know,he spends at least as much time playing as he______.

Find ways to praise your children often, ____ you’ll find they will open their hearts to you.