... mutual understanding between friends. a. must be b. must to be c. must d. be UNIT 1: FRIENDSHIP 9 29. The police let him _____ after they had asked him some questions, a. to leave b. leave c. leaving ... hurt friends, but ( 49) _________________ is always quick to be there. A friend is (50)______________“Of whom much is required, much is given,” 14 BAT TAP TRAC NGHIEM TIENG ANH 11 • PHAN BAI TAP ... c. got / had been prepared d. got / was being prepared 16 BAI TAP TRAC NGHIEM TIENG ANH 11 • PHAN BAI TAP -9. We__________your son in the school play last night. He_________________a terrific...