People work through problems in ways ________ they are unaware.
| A．of which | B．in which |
| C．on which | D．to which |
—Someone has tidied the sitting room!
—Jim __ it this morning; he couldn't bear the mess any more．
| A．has done | B．would do | C．had done | D．did |
Peterson used to work in a remote mountain village school, which is only on foot.
| A．reliable | B．accessible | C．available | D．convenient |
I would appreciate ______ very much if you help me with my English.
| A．it | B．that | C．this | D．you |
Only by practicing a lot _____ our English well enough to communicate with foreigners.
| A．we can learn | B．can we learn | C．learn we | D．we learn |
When she was in trouble, I did what I could to help her.my help, she wrote me a letter of thanks.
| A．In honor of | B．In case of | C．In terms of | D．In return for |