问题详情：
用所给动词的正确形式填空。
1．They'll fly to London if there ________ (be) a holiday this summer.
2. If it snows tomorrow, I ________ (stay) at home to watch TV.
3. If she has time, she ________ (visit) the Science Museum with you next weekend.2
4. Unless he ________ (exercise) more, he will get fatter and fatter.
5. Tom ________ (fail) the exams unless he studies hard.
【回答】
stay visit cises fail
知识点：语法填空
题型：完成句子
