What does the underlined sentence “a jack of all trades” mean?

(单选题)He did not regret saying what he did but felt that he ______ (单选题)If I hadn’t stood under the ladder to catch you when you fel (单选题)______ with the picture, Mary tore it to pieces. (单选题)Compared with his sister, Jerry is even more ______ to and m (单选题)In China, 60 percent of the current health care fee is paid (单选题)Shanghai is ______ that we can hardly visit all the beautifu (单选题)— “Could we put off the meeting?” she asked.— “______.” He a (单选题)—It shouldn’t take long to clear up after the party if we al (单选题)He put up a sign ______ “Keep off the grass”. (单选题)—My room gets very cold at night.— ______.