At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.
| A．take in, give out | B．take up, give off |
| C．take in, give in | D．take off, give up |
The fact that she was foreign made __________ difficult for her to get a job in that country.
| A．so |
| B．much |
| C．that |
| D．it |
I had great difficulty __________ the suitable food on the menu in that restaurant.
| A．find |
| B．found |
| C．to find |
| D．finding |
—What made you so tired?
—__________ driving all day.
| A．Practiced |
| B．To practice |
| C．Practicing |
| D．Practice |
Rather than __________ on a crowded bus, he always prefers __________ a bike.
| A．ride ； ride |
| B．riding ； ride |
| C．ride ； to ride |
| D．to ride ；riding |
Jiaxing is such a beautiful city that it is well worth __________.
| A．visit |
| B．visiting |
| C．visited |
| D．to visit |