Many students ______ chances to show themselves in class because the class size is too big.
A：don't give
B：aren't given
C：haven't given
D：won't give
5×8＝____
50×8＝____
500×8＝____
Are you a student ________ a teacher?
- Lucy, what were you doing at nine last night?
- I ___________ the piano. I usually practice the piano at that time.
