Fire,on the one hand,can benefit the world. On the other hand,it can also destroy the world if not________under control.
Having checked the doors were closed, and ___ all the lights were off, the boy opened the door to his bedroom.
It is none of your business __________ other people think about you. Believe yourself.
You can only be sure of __________ you have at present; you cannot be sure of something __________ you might get in the future.
A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother’s birthday.
These shoes look very good. I wonder __________.