. Only when class began ______that he had left his book at home．
| A．will he realize | B．he did realize | C．did he realize | D．had he realized |
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 |
Mr Li has some trouble sleeping, so dinking a glass of milk before going to bed every night is his common．
| A．practice | B．knowledge | C．experience | D．duty |
The moment John will never forget is Mr．Smith gave him a lot of valuable advice on how to improve his writing．
| A．that; that | B．that; when | C．when; that | D．when; when |