It still remains a question _____ life exists on any other planet in the solar system.
| A．why | B．whether | C．how | D．where |
My parents would have come to see you if it had been possible, but they __________ so busy.
| A．were | B．had been |
| C．have been | D．would be |
The news came as quite a shock to us __________ a ship with 82 passengers on board sank near the north coast.
| A．what | B．that |
| C．when | D．where |
—The Internet is amazing, isn't it?
—Yes. Just __________ it into a socket and you are instantlyconnected to the rest of the world.
| A．to plug | B．plug |
| C．plugging | D．plugged |
Lucy and Mary are two of __________ kind and they both play __________piano in their leisure time.
| A．a; the | B．a; / |
| C．the; the | D．the; / |
The smile on Mother's face suggests that she _________ satisfied with what her daughter has done.
| A．should be | B．is |
| C．was | D．be |