27. After his wife died, he kept himself _____ from other people and the outside world,
| A．set off | B．cut off | C．put off | D．taken off |
My friend showed me round the town，__________ was very kind of him.
| A．which | B．that |
| C．where | D．it |
They've won their last three matches，__________ I find a bit surprising actually.
| A．that | B．when |
| C．what | D．which |
Gun control is a subject __________ Americans have argued for a long time.
| A．of which | B．with which |
| C．about which | D．into which |
English is a language shared by several diverse cultures, each of __________ uses it somewhat differently.
| A．which | B．what |
| C．them | D．those |
Between the two parts of the concert is an interval，__________ the audience can buy ice cream.
| A．when | B．where |
| C．that | D．which |