The house prices fell sharply at the end of last year, but ______ at the beginning of this year.
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.
__________, Carolina couldn’t get the door open.