He made another wonderful discovery, of great importance to science.
| A．which I think is |
| B．which I think it is |
| C．which I think it |
| D．I think which is |
It's doing the things you likemakes life happy.
| A．which | B．that |
| C．so | D．and |
Only when you can find peace in your heartgood relationship with others.
| A．will you keep | B．you will keep |
| C．you kept | D．did you keep |
Students should involve themselves in community activitiesthey can gain experience.
| A．who | B．when |
| C．which | D．where |
The exact yearAngela and her family spent together in China was 2008.
| A．when | B．where |
| C．why | D．which |
How could yousuch a fantastic job when you have been out of job for months?
| A．turn to | B．turn on |
| C．turn off | D．turn down |