—Someone wants you on the phone. —__________ nobody knows I am here.
| A．Although | B．And |
| C．But | D．So |
Although he is always coming on time，he is usedlate for his class.
| A．to have students | B．for students’ being |
| C．to students’ being | D．for students’ to be |
Although the causes of cancer ____we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
These wild flowers are so special that I would do ____I can to save them.
| A．whatever | B．that | C．which | D．whichever |
The computer system____ suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out | C．broke up | D．broke in |
–When can I come for the photos? I need them tomorrow afternoon.
-They ___be ready by 12:00
| A．can | B．should | C．might | D．need |