His first baby was born soon after he got married, which seemed to have ___his sense of responsibility.
My English teacher's humor made every student __________.
A __________ is someone elected to speak on behalf of others.
The little boy saved every coin __________ he could buy his mother a present on Mother's day.
People often mistake some __________ objects such as kites or balloons for UFOs.
—Did you happen to see __________ black and __________ white cat? —Are they missing? I told you to take care of them.