.It is ______ to spend money on preventing illnesses by promoting healthy living rather than spending it trying to make people ______ after they are ill .

What do you think of Beijing— Wonderful. It ________ changed a lot in the last few years.

We can see no clouds in the sky Therefore, there’s no doubt ______ it will be fine tomorrow

How could you be so rude as to walk in here in the middleof my class—_____________

Some pre-school children go to a day care center, __________ they learn simple games and songs.