四、在表格中选择合适的词语，使句子通顺合理。(8分)
of , with, at, in, on , Thank you, must, doing
1、 There is something wrong ________ my watch.
2、They go to the park _________ weekends.
3、This is an old photo __________ my family.
4、Mike usually gets up _________ 6:45.
5、We _______ go home now.
6、We plant trees ________ spring.
7、“ What is he _______?” “ She is reading.”
8、A：Happy birthday to you! B：____________.