—How far can you run without stopping?— ________. I’ve never tried.
30.Little _________ that we were watching his every move, so he seemed to be going his own way in this business.
29. The nutrients in ____ falls into the ocean will quickly become available to other living creatures.
28. I don’t think you’ve quite__the seriousness of the situation. You seem to know nothing about it.
20.The river, ________ banks are covered with trees, is beautiful and it attracts many water birds.
19.From this year’s poor results, one can see ______ many changes have been made in the football team and that, sadly, it is no longer ______ it once was.