______ he came to our school, our teacher was sitting in the meeting room.

Please answer the question in a loud enough voice______ all the class may hear.

—Let’s go fishing if it ______ this weekend.
—But nobody knows if it ______.

The meeting didn't start______ everyone was there.

If it ______ tomorrow, we'll have a trip to Xiang Mountain.

I don't know if he ______ you. If he ______ much time at that moment, he will.

I will tell him as soon as he ______ back.

---Is your uncle still smoking?
---Yes. It’s nearly five years _______ he smoked.

---I wonder if he ______ us in the discussion tonight.
---I believe if he ________ his homework, he will join us.

I don’t know _____ he will come tomorrow. _____ he comes, I’ll tell you.