31. ________was difficult to save 
the places and buildings _____destroying their old beauty.
| A．That…unless | B．This…except | C．It…without | D．There … except for |
The door ．Better have it repaired．
| A．won’t shut | B．hasn’t been shut | C．won’t be shut | D．isn’t shut |
Nine thousand guests took part in the outdoor ceremony, that impressed so many people at the White House．
| A．that | B．this | C．it | D．one |
The local government is trying all out to find out who is the forest fire．
| A．to blame for starting | B．to blame to start |
| C．to be blamed for starting | D．to be blamed to start |
—How can we reduce CO2 in our home?
—It’s easy． off your TV or computers when you’re not using them, and you’ll greatly reduce it．
| A．Turn | B．To turn | C．Turning | D．Turned |
—Have you been ?
—Yeah．As a matter of fact, I’ve been going to the gym for half a year now．
| A．carrying out | B．turning out | C．making out | D．working out |