In the past few decades, scientists have made a great ________ in the treatment of cancer.
A. breakout B. breakdown C. breakup D. breakthrough
Volunteers are making use of every minute to________ their foreign languages because language volunteers must pass a written test and an interview.
A. put up B. polish up C. take up D. make up
Leaving the door unlocked is an open _________ to burglars(夜盗).
A. adaptation B. transformation C. invitation D. participation
The virus came without people’s being aware of it and it was _________ assumed to be a common one. But with more cases reported, it proved wrong.
A. accurately B. relatively C. purely D. initially
A yellow background will make the black characters ________.
A. stand up B. stand by C. stand for D. stand out
With many major economic problems ______ to be addressed, there is no point ______the growth rate of this year now.
A. remained; evaluating B. remaining; to evaluate
C. remaining; evaluating D. remained; evaluating
