He went from door to door, _______ waste papers and magazines.
Some researchers believe that many patterns of nature are rules of their own and not affected by natural selection.
—Can I look at the menu for a few seconds before I decide? —Of course. ,sir.
Only when in the afternoon able to leave.
There are 51 students in Class Three, _____ failed in the test.
______ happened to be no one in that house when the typhoon hit the area.