—We need to turn to Professor Smith for help.
—_________? Our classmate Simon is an expert at solving such problems.
A. Why not B. How come
C. Why bother D. What for
—Jane really cares what others say about her.
—No wonder she is always ________.
A. letting the cat out of the bag B. walking on egg
C. like a cat on hot bricks D. more brave than wise
—Have you heard the bad news that Stephen Hawking， one of world’s greatest physicist passed away on March 14?
—You bet! It is only when you suddenly lose someone _______ you fully realize how much you value him.
A. do B. then
C. will D. that
Had he taken his parent’s advice, he ______ having made such a silly mistake now.
A. would not regret B. would not have regretted
C. may not regret D. does not regret
Just when we are going to have a holiday, my little son ________ have a headache.
A. dare B. can
C. may D. must
This kind of virus _______ via the bloodstream and causes ill health in a variety of organs.
A. corresponds B. circulates
C. abandons D. accelerates
