＿＿＿＿Sunday, the students are at home.
| A．Being | B．To be | C．It is | D．It being |
We have launched another man-made satellite, ______ is announced in today’s newspaper.
| A．that | B．which | C．who | D．what |
Nowadays people are more concerned about the environment _______ they live.
| A．what | B．which | C．when | D．where |
There is no simple answer, _____ is often the case in science.
| A．as | B．that | C．when | D．where |
Finally he reached a lonely island _________ was completely cut off from the outside world.
| A．when | B．where | C．which | D．whom |
He wrote a letter ______ he explains what had happened in the accident.
| A．what | B．which | C．where | D．how |