Walking in space _________sound easy, yet great care and skills are required.
| A．may | B．shall | C．should | D．must |
She brought with her three friends, none of _____ I had ever met before.
| A．them | B．who | C．whom | D．these |
_______ ambassador who did his best to prevent the war is of _______ benefit to the place.
| A．An; 不填 | B．The; a |
| C．The; 不填 | D．An; a |
I will never forget those days, ______ I spent in the countryside together with my grandmother as a child.
| A．when | B．which | C．on which | D．in which |
─ How did you find the goods, Mrs. White?
---- ______. They are well worth the money, I suppose.
| A．On the Internet | B．Couldn’t be better |
| C．Totally by chance | D．Take it easy |
The "Chinese Dream" is _____ dream to improve people's well-being and _____ dream of harmony, peace and development.
| A．the; a | B．a; a | C．a; the | D．the; the |