1¡¢—Have a good trip, Jane!

—____ .

A. Thank you   B.Me, too       C. You are welcome   D. That is OK

2¡¢The students must ____ the school rules when they are at school.

A. hear         B. obey          C. listen to                    D. look at

3¡¢— Why ____ some stamps for her?.

— OK! Let us go.

A. do not buy          B. not buy             C. not to buy         D. not buying