—Tomorrow will be fine. Shall we go out for a picnic?
—Shall we play football after class together?
—_____________________正确答案是：Great, that's a good idea.
The train is running fifty miles ______.
If it rains tomorrow, we _________ to picnic.
I would like to do the job ________ you don't force me to study.
正确答案是：as long as