选出适当的词填空。
1. A:I need some money. What _______ ( could; should) I do?
B: You should get a part-time job.
2. A: I don't want to study at the library.
B: You _______ ( shouldn't; could) study at my house.
3. A: This shirt is really ugly.
B: Then you _______( could; shouldn't) wear it to school.
4. A: I don't like writing letters.
B: You _______ ( could; shouldn't) use the telephone.
5. A: I want to surprise my parents.
B: You_______ ( shouldn't;could) buy them a CD.
