I think that studying in pairs or groups is necessary____you want to learn from each other in class.
| A．though | B．until | C．unless | D．if |
—_________ nice trip to travel by air!
—__________.
| A．How a; So it is. | B．What a; So it is. |
| C．How ; So is it. | D．What ; So is it. |
______ twenty minutes enough for you to get to the station?
| A．Are | B．Do |
| C．Is | D．Does |
In the past few years there ________ great changes in my hometown.
| A．has been | B．have been |
| C．have had | D．were |
To make our city more beautiful, rubbish _________ into the river.
| A．needn’t be thrown | B．can’t thrown |
| C．mustn’t be thrown | D．may not thrown |
— Does your mother often _______ to you?
— Yes. But she always ________ the same words.
| A．talk; say | B．talk; says |
| C．speak; tells | D．talk; speaks |