Food safety issues, ____ will seriously affect the growth of teenagers and even the nation’s future.
| A．if not solved properly |
| B．not if solved properly |
| C．if solved properly |
| D．not if properly solved |
They arrived at a farmhouse, in front of ______sat a small boy.
| A．whom | B．who | C．which | D．that |
The pen ______he is writing is mine.
| A．with which | B．in which | C．on which | D．by which |
Can you lend me the book ______the other day?
| A．about which you talked | B．which you talked |
| C．about that you talked | D．that you talked |
This is one of the best films _______.
| A．that have been shown this year | B．that have shown |
| C．that has been shown this year | D．that you talked |
Great changes have taken place since then in the factory _______we are working.
| A．where | B．that | C．which | D．there |