They often go to the restaurants for meals. They _____ be very poor.
| A．mustn’t | B．can’t | C．may not | D．needn’t |
He wrote to tell me that there was no need to worry about him and he had offered to clean the community __________ a week's accommodation.
| A．in exchange for | B．with regard to |
| C．by means of | D．in place of |
He is teaching me French __________ my teaching him Chinese.
| A．in place of | B．in case of |
| C．in exchange for | D．in honor of |
The committee __________ over the problem among themselves for two hours.
| A．has argued | B．has been arguing |
| C．have argued | D．have been arguing |
—Liu Fang, I don't know you can play the Pipa and Guzheng so well.
—Well, actually I __________ it since I was six years old.
| A．plays | B．have been playing |
| C．played | D．had been playing |
Betty and Louis __________ with each other at first sight and they __________ in love for five years ever since.
| A．fell in love; have been | B．fell in love; have fallen |
| C．were in love; have been | D．were in love; have fallen |