Cooking calls for _______ patience and time but it is _______ enjoyable experience.
| A．a; the | B．不填; an | C．the; an | D．a; 不填 |
I found John _____ the desk, _____ his homework carefully.
| A．seated at; to do | B．sitting at; doing |
| C．sat at; does | D．taking his seat at; to do |
We must set about _____ our lesson for the mid-term examination.
| A．reviewing | B．reviewed | C．to review | D．to reviewing |
I can't understand _____ at that poor child.
| A．you to laugh | B．you laughing | C．you laugh | D．why laugh |
–Can you spare me some time? –I'm afraid not. I have lots of letters _____.
| A．doing with | B．to do for | C．to deal | D．to deal with |
The patient was warned _____ oily food after the operation.
| A．to eat not | B．eating not | C．not to eat | D．not eating |