I can't understand _____ at that poor child.
| A．you to laugh | B．you laughing | C．you laugh | D．why laugh |
The problem of global warming is serious. ______, the sea levels have risen a little.
| A．As a result | B．On the contrary |
| C．In particular | D．In other words |
At the beginning of class, the noise of desks ______ could be heard outside the classroom.
| A．opened and closed | B．to be opened and closed |
| C．being opened and closed | D．to open and close |
Yesterday morning he got up earlier than ______, for it was not a(n) ______ day.
| A．common; usual | B．common; ordinary |
| C．usual; normal | D．usual; ordinary |
The medical reform in that 
country turns out to be ______ failure, but as we know, success often comes after ______ failure.
| A．a; the | B．a; 不填 | C．a; a | D．不填; 不填 |
Having a trip abroad is certainly good for the old couple, but it remains ______ whether they will enjoy it.
| A．to see | B．to be seen | C．seeing | D．seen |