The professor held the crucible the Bunsen flame when heating the substance.
| A．in | B．above | C．beside | D．over |
I wish you ______ go with me tomorrow.
| A．will | B．would | C．shall | D．/ |
We ________ the difficulty together, but why didn’t you tell me?
| A．should face | B．might face | C．could nave faced | D．must have faced |
He will _______ you next week if he is free.
| A．drop in | B．drop in at | C．drop in on | D．call at |
Oh, Mary, why are you killing your time this way ?Can’t you find something____ doing at all?
| A．useful | B．valuable | C．worth | D．good |
Many families were broken up and their members were killed in the _______ caused by the earthquake inYaan.
| A．chaos | B．chains | C．plains | D．masses |