______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
| A．If | B．As | C．Because | D．While |
The light is still on. He _____ to turn it off when he _____ the room.
| A．may forget: leave | B．must have forgotten : left |
| C．may forget : have left | D．could have forgotten : left |
The reason ______he was late for class was not the reason ______he gave me.
| A．that ; where | B．why; because | C．which; that | D．why; that |
She heard a terrible noise,______brought her heart into her mouth.
| A．it | B．which | C．this | D．that |
I have an itch ____ writing.
| A．for | B．in | C．with | D．on |
_____ the lab, we were taken to see the library.
| A．After having shown | B．Having shown | C．Having been shown | D．To be shown |