Having a trip abroad is certainly good for the old couple，but it remains __________ whether they will enjoy it.
| A．to see |
| B．to be seen |
| C．seeing |
| D．seen |
There is a great deal of research ___that music activities engage different parts of the brain.
| A．indicate | B．indicating | C．to indicate | D．to be indicating |
Teenagers have reached a point in their life_____they are supposed to make decisions of their own for the first time.
| A．which | B．where | C．how | D．why |
They are considering ____ the house before the prices go up.
| A．purchase | B．purchasing | C．purchased | D．to purchase |
_______ more about Participant Service of Expo 2010, Shanghai China, call Hotline +86-21-962010.
| A．To find out | B．Finding out | C．Find out | D．Having found out |
— Why did you leave that company?
— I _______ a better position at IBM.
| A．offer | B．offered | C．am offered | D．was offered |