---Remember how we met for the first time, Dick? ---Of course I do. You _________ to the teachers' office hurriedly and ___________ me.
---How long do you think it will be __________ China sends a manned spaceship to the moon? --- Perhaps two or three years.
You’d better take something to read when you go to see the doctor __________ you have to wait.
Tom is one of the boys who __________ on time.
__________ they will not come to join us, we have to change our plan.
That is __________ the problem lies.