No sooner______ themselves in their seats in the hall than the speaker began his speech.
A. they settled B. had they settled
C. did they settle D. they had settled
Achieving a high degree of proficiency(精通）in English as a foreign language is not a mysterious _______ without scientific basis.
A. process B. practice C. procedure D. program
Generally speaking, if ______ strictly following the instructions, the electric bike is not as dangerous as reported.
A. riding B. being ridden C. to be ridden D. ridden
On the National Day, up _____ into the air. Then the crowed cheered.
A. the balloons wentB. went the balloons
C. go the balloons D. did the balloons go
The club, _____ 25 years ago, is holding a party for past and present members.
A. founding B. founded C. being found D. to have found
We were playing near the lake______ the storm started.
A. while B. when C. until D. before
