With the send-up of the spaceship approaching, occasions are rare _________ the staff can spend a weekend with their families.
| A．when | B．where |
| C．which | D．that |
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 |
Ted came for the weekend wearing only a T-shirt and shorts，__________ is a stupid thing to do in such weather.
| A．this | B．that |
| C．what | D．which |
The children，__________ had played the whole day long, were worn out.
| A．all of what | B．all of which |
| C．all of them | D．all of whom |
We have launched another man-made satellite，__________ is announced in today's newspaper.
| A．that | B．which |
| C．who | D．what |