Many countries are now setting up national parks __________ animals and plants can be protected.
| A．when | B．which |
| C．whose | D．where |
Many English learners find that ______ pronunciation helps them improve a lot.
| A．contributing to |
| B．consisting of |
| C．taking control of |
| D．paying attention to |
More and more women are working in this factory, ______ more than 40% of the workers.
| A．putting up | B．making up |
C．picking up | D．giving up |
To tell you the truth, I have a hard time remembering all the ______ rules of English grammar.
| A．interesting | B．confusing |
C．exciting | D．surprising |
—You haven’t returned my chemistry textbook yet.—I know, but I ________ it for five days.
| A．will have been looking for |
B．have been looking for |
C．will be looking for |
D．had looked for |
David left word with my secretary ________ he would call on me in the afternoon.
| A．who | B．that | C．where | D．which |