-Do you know if he will come tomorrow?-No,but if he ,I’ll call you to have a meal together.
---Who cleaned the blackboard yesterday, Dick? ---John _________.
A talk on Chinese history ________ in the school next week.
I _____ 900 English words by the time I was ten。
--Let's go fishing if it _______ this weekend. --But nobody knows if it_______.
The room ___ cool in summer and'warm in winter.