用括号内所给词的正确形式填空。
1. Listen! Where ________ the birds ________ (sing)?
2. — Can you ________ (tell) me the way to the hospital?
— Sure.
3. The students stop ________ (talk) when the teacher comes in.
4. My sister likes ________ (play) with her friends at the weekend.
5. I want ________ (have) a hot dog. How much is it?