选用括号中所给动词的适当形式填空。（共5分）
1.Some students want __________ (be) teachers when they grow up.
2.My brother __________ (not do) his homework on Saturdays.
3. How long do you usually spend __________ (chat)with your parents every day?
4. I have no time ____________ (write) to you.
5. Can you tell me how ____________ (send) an e-mail?