—_______have you known each other? —Since we were in our childhood．
| A．How far | B．How often |
| C．How long | D．How soon |
I will perform _______ the piano in the concert to be held tonight.
| A．with | B．on | C．at | D．/ |
His actions _______ his thoughts.
| A．reflected | B．effected | C．affected | D．rejected |
It’s easy for David to find the library because of his good ______ of direction.
| A．idea | B．feeling | C．experience | D．sense |
The woman who is talking with Mr. Brown______ be Miss Li. She has gone to England.
| A．can’t | B．must | C．may | D．mustn’t |
.You ____ be tired—you’ve already been working for three hours without having a rest.
| A．must | B．mustn’t | C．can’t | D．may not |