The research is so designed that once _______ nothing can be done to change it.
| A．begins | B．having begun |
| C．beginning | D．begun |
To make the city look more beautiful, a lot of old houses along the street have been _____.
| A．brought down | B．put down | C．turned down | D．pulled down |
— Are there any English story books for us students in the library？
—There are only a few,_________
A if any B if someC if have D if has
—Coffee _________ milk?
—Only milk , please, _______ I used to like coffee.
A and; and B and; but C or ; and D or ; but
Viewers will have ____ second chance to see Saturday’s concert on ____ Channel 4 tonight.
| A．a; the | B．the; the | C．the; 不填 | D．a; 不填 |
I really don’t know _______ I put my wallet.
| A．where was it | B．it was where that |
| C．where it was that | D．where was it that |