My pain ___________ obvious the moment I walked into the room, for the first man I met asked me pitifully:" Are you feeling all right?"
| A．must be | B．must have been |
| C．could be | D．could have been |
Scientists are convinced _____the positive effect of laughter _____physical and mental health．
| A．of ;on | B．by; in | C．of ; at | D．on ;at |
Could you give me a hand? It seems that my strength has _________.
| A．used up | B．been given out | C．run out | D．been run out |
Unfortunately, ____ stone hit him on ______ head and he got injured.
| A．the; a | B．a; 不填 | C．a; the | D．the ; the |
—I’m sorry I broke your teapot.
—.
| A．Forget it | B．You are welcome | C．Definitely | D．Not really |
I thought our friendship was finishedJenny apologized first and I forgave her right then．
| A．when | B．until | C．while | D．unless |