_____ underground for 2 years, David says the worst thing is not the danger but the darkness.
| A．Working | B．Having worked |
| C．To have worked | D．Worked |
-----where has his brother been ?
------No one knows. He has returned home safely but his missing made the police _____ .
| A．to puzzle | B．puzzling | C．puzzled | D．be puzzled |
I don’t think I’ll need any money but I’ll bring some _____ .
| A．at last | B．in case | C．once again | D．in time |
You don’t have to _____ me you’re the right person for the job.
| A．believe | B．research | C．convince | D．admit |
I wrote a letter of complaint, and the airline has promised to _____ the matter.
| A．look up | B．look into | C．look through | D．look for |
-------Take a break, Amy. You ________ on the piano all morning.
-------I’d like to, but this time next week I _______a concert at Music Hall.
| A．have practiced, will give | B．are practicing, am giving |
| C．have been practicing ,will be giving | D．will have practiced, have been giving |