Not until I began to work ____ how much time I had wasted.
| A．didn't I realize | B．did I realize | C．I didn't realize | D．I realized |
When Peng Liyuan , First Lady of China , made her first public appearance overseas, her grace and perfect dress have earned her international ________.
| A．regulation |
B．recognition |
C．reception |
D．appreciation |
The Fifth Euro-Asia Economic Forum, held in Xi’an on 1st October, 2013, is aimed to ____ economic exchanges between Asia and Europe.
| A．preserve |
B．promote |
C．accomplish |
D．update |
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 |