Having checked the doors were closed , and _________ all the lights were off, the boy opened the door to his bedroom.

In the global economy, a new drug for cancer, _________ it is discovered, will create many economic possibilities around the world

How long did it themto go there by bus

I can’t give my son the leading position______, he is too young; secondly, I want MrSmith to have the job

I don’t know if it _________ tomorrow. Wewon’t go shopping if it ____________.