28. Please remember___wins you respect is not your background but your knowledge and virtues.
| A．that | B．what | C．which | D．where |
The origin of ____ life on earth is ____ question that interests astronomers.（原创）
| A．the; the | B．\; a | C．\ ; the | D．the; a |
---_______ they stop to have a rest?
---No, let them go on.
| A．Will | B．Would | C．Shall | D．Should |
He was so lucky to ______ only a fine for such a serious mistake.
| A．get through | B．get over | C． get away with | D．get across |
Even scientists cannot completely ________for the strange behaviors of the animals before an earthquake. （原创）
| A．spot | B．explain | C．call | D．account |
He is said _______ a new machine recently, but I don’t know when he will make it.
| A．to design | B．to be designed |
| C．to have designed | D．to have been designing |