There______ a number of natural mysteries in the world that even make scientists ______.
| A．exists; confusing | B．are existed; confused |
| C．exist; confused | D．exist; confusing |
A large number of students in our class____ girls.
| A．are | B．was | C．is | D．be |
There ____ a pen, two pencils and three books on the desk.
| A．are | B．is | C．has | D．have |
20 They told me it would be cheap but ________it cost me nearly 5000 yuan.
| A．as a result | B．in a word | C．at last | D．in fact |
19. What way are you thinking of ______rid of the air pollution in our capital city.
| A．to get | B．getting | C．being getting | D．being got |
18. ---- Are you free after school?
---- Sorry. I’ve planned to treat a friend of mine to dinner _______for his help.
| A．in charge | B．in honour | C．in turn | D．in return |