They are still very cautious about ________ side effect the new medicine will bring about, although the experts have tried it on about 2000 patients.
Hearing the news, he rushed out, ___the book __on the table and disappeared into the dark.
. She was so angry and spoke so fast that none of us understood ____ she said meant.
At the sight of the policeman, ____ from behind the door.
Only when ___ possible to settle the problem.
___ different life today is from ___ was 50 years ago!