The survey shows that ______ we are enjoying less and less good sleep, rates of heart diseases have risen rapidly.
________ many times, he finally understood it.
—The weather isn't good enough for an outing,is it?—Not at all. We can't have ________ at this time of the year.
The other day, my father drove his car at ___ I thought was a dangerous speed.
—How much do you know about the 3D film technology?—A little. Not until _____ the hot movie Avatar______some about it.
All possible means ______. However, nothing can _____ his wife dying of lung cancer.