--Would you like to come to dinner tonight?
--I will ________ I'm not too busy.
-What is behind that tree?
-There must be a dog ________ beside it.
--Are you happy to have the two-month summer holiday?
--Sure. We can relax ourselves and do many things we like.
-________ is it going?
-Pretty good.
--Excuse me, can I smoke here?
--No, ______.
-I feel a bit hungry now.
- Why not _____ for dinner with us?
--They have a lot of rules at their house.
--__________