1．After walking the whole day, I was almost out of
________(breathe), not feeling bad, though.
[答案] breath
2．During the war there was a serious lack of food. It was not unusual that even the ________(wealth) families had to do without bread for days.
[答案] wealthy
3．Listen carefully, ________ you'll miss something important.
[答案] or/otherwise
4．Many students are crazy ________ chatting online, which wastes them plenty of time.
[答案] about
