A man may usually be known by the books he reads ________by the friends he keeps.

Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.

Some women ________ a good salary in a job instead of staying home, but they decided not to work for the sake of the family.

Just 10 percent of the 30 million Chinese currently suffering from depression are getting proper medical care _____ a lack of enough healthcare and social prejudice against mental illness, experts have said

(2013·高考江苏卷)I should not have laughed if I________ you were serious