（题文）In history, the Romanies were divided into different groups and developed their own languages, _____ there are now around sixty varieties.
A. by which B. of which
C. by whom D. of whom
Robert’s new book about space exploration is wonderful. You simply _____ read it.
A. must B. will
C. need D. may
The only time that we _____ to do something like doing some volunteer work was in the city of Philadelphia.
A. advised B. attended
C. attempted D. awarded
Beijing will host the 2022 Winter Olympic Games, which is the first city _____ both Summer and Winter Olympics.
A. hosting B. to host
C. having hosted D. to have hosted
—I would like to have your opinion about my essay.
—Hmm, you need make _____ changes to it, because there are some text construction errors.
A. long-term B. gradual
C. significant D. sudden
—Shall we start right now? Our train leaves in half an hour.
—_____! I’ll finish packing in a minute.
A. Hang on B. Hang up
C. Keep on D. Keep away
