—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
People from all walks of life are eager for success, ______lack of confidence, however, is a great barrier.
A. where B. which
C. to which D. beyond which
Important _______ having an ambition is, it must be channeled in the right direction. Otherwise, it would ruin ourselves and others.
A. though B. if
C. when D. while
