＿＿＿＿to my regret, I am unable to accept your warm invitation.
| A．Very | B．Much | C．Great | D．A lot |
Peterson used to work in a remote mountain village school, which is only _____ on foot.
| A．reliable | B．accessible | C．available | D．convenient |
-- Did you visit your grandparents yesterday?
--Yes, and when I got there, they _____ in the fields .
| A．worked | B．have worked | C．were working | D．had worked |
_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.
| A．What | B．It | C．As | D．Which |
In Australia, surfing is a popular sport among young people _____ they can seek excitement and adventure.
| A．that | B．which | C．whom | D．where |
The children went home from the grammar school, their lessons _____ for the day.
| A．finishing | B．finished |
| C．had finished | D．had been finished |