---- How long do you think it is______ he arrived here?---- No more than half a year, I believe.
Hurry up, _____ you won’t catch the early bus.
She _______ when I went to see her.
We won’t go to the Great Wall until the rain _______.
I will give the message to him __________he comes back.
We won’t go to the Great Wall if it ___________ the day after tomorrow.