A beam of light will not bend round corners unless______to do so with the help of a reflecting device .
| A．having been made | B．being made | C．made | D．you make |
—Oh my god! You__ wear slippers to attend the conference．
—I'm sorry I forgot there is a conference．
| A．must | B．can | C．should | D．shall |
In this experiment, the famous professor showed three different____ to the study of physics．
| A．means | B．methods | C．ways | D．approaches |
_______the match is lost? We can fight again!
| A．Even though | B．What though | C．If though | D．As though |
These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on．
| A．would have been unthinkable | B．would not be unthinkable |
C．would be unthink able |
D．would not have been unthinkable |
I made a fire ____up the room as soon as my father came in．
| A．warm | B．warmed | C．to warm | D．warming |