— Don’t you think the new job is a real challenge for Jack?
—Well, ______ difficulties he meets, I believe he will never lose heart.
| A．whenever | B．however |
| C．whichever | D．whatever |
It is said that a reliable treatment for the disease will be applied at least two or three months away and still it ______on animals.
| A．is testing | B．has tested | C．is being tested | D．has been tested |
Professor Lee arrived in Paris in 2009, ______, some time later, he was employed by a famous computer company.
| A．that | B．when | C．where | D．which |
--- Can I borrow this novel?
---Sorry. Only teachers and students in our school enjoy the ______.
| A．opportunity | B．status | C．privilege | D．convenience |
I’m calling, ______my company, to thank you again for your generous help.
| A．in favor of | B．in honor of | C．in memory of | D．on behalf of |
China might one day explore other planets, the ______designer of Chang’e-I told China Economic Weekly.
| A．major | B．main | C．primary | D．chief |