--My house is very near a busy street.
--It ________ be very quiet.
---Would you like to have dinner with my parents?
---________.
-How long do you suppose it is ________ he arrived here?
-About half an hour.
--I'm busy right now. Could you come back ________ time?
--OK. See you later.
-Don't you usually come to school by bus?
-________.
---Are there any ________ on the farm?
---Yes, there are some.
--Bruce often helps old people.
--It's very kind ________ ________.
-Is Wei Fang good at singing?
-Yes, she is.We often hear her ________in the next room.
-Do you know when the PLA was founded?
-Ought we to pay the bill right now?
-No, you ________.