_________ is known to us all is that 2012 Olympic Games will take place in London.
| A．It | B．What | C．As | D．Which |
To keep ______, we must do more out-of-door exercises.
| A．well | B．fine | C．fit | D．health ‘ |
Thank you for_______ my trouble.
| A．talking | B．going | C．sharing | D．getting |
It is worth considering what makes “convenience” foods so popular, and ____ better ones of your own.
| A．introduces | B．to introduce |
| C．introducing | D．introduced |
I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back.
| A．before | B．since | C．till | D．after |
If you really have to leave during the meeting, you'd better leavethe back door.
| A． | for | B． | by | C． | across | D． | out |