Scientists conclude that female cats tend to favor their right paws when _______ complex tasks.
| A．knocking about | B．bringing in | C．holding up | D．taking on |
It’s often less expensive to buy goods in ________quantity，but you’d better examine ________ quality before buying them.
| A．/；the |
| B．the；/ |
| C．a；the |
| D．the；the |
I thought I was going to fail the exam，but I succeeded ________.
| A．after all |
| B．first of all |
| C．in all |
| D．at all |
Chances are high ________ China and Russia will make an agreement to build an oil pipeline.
| A．when |
| B．where |
| C．that |
| D．which |
The report says ________ number of endangered animals is increasing，for ________ number of them are being hunted or having no food to eat.
| A．the；a |
| B．the；the |
| C．a；a |
| D．a；the |
Don’t worry！There are ________that the situation is improving.
| A．signs |
| B．marks |
| C．symbols |
| D．signals |