——How much do I owe you for lunch?
——______. It’s nothing.
| A．You’re welcome | B．Forget it | C．With pleasure | D．That’s right |
The biggest whale is ___ blue whale, which grows to be about 29 meters long—the height of ___ 9-story building.
| A．the; the | B．a; a | C．a; the | D．the; a |
We can never expect____bluer sky unless we create____less polluted world.
| A．a; a | B．a; the |
| C．the; a | D．the; the |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |
This area experienced.____heaviest rainfall in_____month of May.
A. 不填; A. B. a; the C. the; the D. the; a
Let’s go to_____cinema-that’ll take your mind off the problem for____while 
| A．the; the | B．the; a |
C．a; the | D．a; a |