1．They amused themselves by looking at old photographs.
2．I would appreciate it if you would turn the music down.
3．It doesn’t often rain in the summer here.As a result，we have to water the vegetable garden.
4．It’s up to her to decide whether or not to go on the course.
5．这位新老师给学生留下了很好的印象。
答案不唯一