21. Many young people, most _____ well received, headed for remote regions to chase their dreams.
A. of which B. of them C. of whom D. of those
22. I believe that their chances of survival will be great ______ they do not panic.
A. as though B. even if C. providing that D. so that
23. With the three historic tasks _____, we Chinese should keep on working with great determination.
A. to accomplish B. having been accomplished C. accomplished D. to be accomplished
