The space is left to let the rail expand when it gets hot, ______?
| A．isn’t it | B．is it | C．doesn’t it | D．does it |
I have told you the truth. ________ I keep repeating it?
| A．Must | B．Can | C．May | D．Will |
I had been working on math for the whole afternoon and the numbers ________ before my eyes.
| A．swim | B．swam | C．swimming | D．had swum |
I am blessed with a great class, ________everyone is hardworking, kind and friendly to each other.
| A．one where | B．the one that | C．the one where | D．one that |
________ many times, he still repeated the same mistake.
| A．Having been told | B．Having told | C．Telling | D．Told |
It is illegal for a public official to ask people for gifts or money ________ favors to them.
| A． in addition to | B．in return for |
| C．in revenge for | D．in search of |