23. The Chinese government has made ________ a goal to increase peasants’ income.
| A．it | B．this | C．that | D．One |
——Could I speak to Mr Brown？ —— ______ ， I'1l go and see if he is in.
| A．Who are you | B．He isn't here | C．I'm sorry | D．Hold on， please |
Your English teacher looks very young； He _____ be over 30.
| A．mustn't | B．can't | C．won' t | D．may not |
——Need I clean the room now？
——Yes， you _____ ， but you ______ ask someone to help you.
| A．need， need | B．must， can | C．need， can | D．must， need |
——Don't forget to come to my birthday party tomorrow.——______.
| A．I don't | B．I won't | C．I can't | D．I will |
What do you think ______ an apple ______ to the ground？
| A．cause， to fall | B．to cause， falling |
| C．causing， falling | D．causes， to fall |