They kept trying _____ they must have known it was hopeless.
| A．if | B．because | C．when | D．where |
Although the working mother is very busy, she still ______ a lot of time to her children.
| A．devotes | B．spends | C．offers | D．provides |
When you are learning a foreign language, _______, you must forget your own language.
| A．at the first | B．first of all | C．in first | D．first at all |
Great changes _______ in the city, and a lot of factories _______.
| A．have been taken place; have been set up | B．have taken place; have been set up |
| C．have taken place; have set up | D．were taken place; were set up |
---How often do you go home?
---________.
| A．For three weeks | B．Three weeks ago | C．Every three weeks | D．In three week’s time |
I have two brothers, ________ are doctors.
| A．both of them | B．both of whom | C．neither of whom | D．each of them |