It was not until the teacher had explained it three times _______ how to work out the problem.
A. did he understandB. had he understood
C. that he understoodD. that he didn’t understood
Only after my friend came ____.
A. did the computer repair B. he repaired the computer
C. was the computer repaired D. the computer was repaired
Dickson left his father’s firm and ____business on his own.
A. started out B. launched into C. began on D. worked at
There is no doubt _______international cooperation is the key to dealing with cyber crime.
A. then B. that C. wheather D. this
Considering your salary, you should ________ at least 100 dollars a week.
A. put up B. put forward C. put aside D. put out
The sunlight is white and blinding _______ hard-edged shadows on the ground.
A. throwing B. being thrownC. to throw D. to be thrown
