.It isn't quite _____ that he will be present at the meeting.
| A．sure | B．right | C．exact | D．certain |
the students came from different countries, they got along quite well in the summer camp.
| A．While | B．Unless | C．Since | D．Until |
—Where is Peter? I can't find him anywhere.
—He went to the library after breakfast and ________ his essay there ever since.
| A．wrote | B．had written | C．has been writing | D．is writing |
-I wonderMary has kept her figure after all these years.
-By working out every day.
| A． | where | B． | how | C． | why | D． | If |
________more about Chinese culture, Jack has decided to take Chinese folk music as an elective course.
| A．Learn | B．Learned | C．To learn | D．To be learning |
—Sorry, Mum! I failed the job interview again.
—Oh, it's too bad. You________ have made full preparations.
| A．must | B．can | C．would | D．Should |