The number of the tigers is getting ________. If we don’t help them, they will disappear ______a few years
_____ a smile on his face, he came into the classroom.
A: Hey, man. You can’t cross the street now. You have to wait _____ the traffic lights turn green.B: Oh, sorry and thank you.
A: Have you got any books on computers? I want to borrow _______.B: Yes, Here you are, but you must return _____ by Friday.
They got married ____ 2010. That means they have been married _____ 2010.
I think the place has changed ______ over the last years.