21. What kind of _______ did the professor give his students when they want to solve a problem?
a. consult b. punishment
c. advice d. compliment
22. Parents should______ certain rules for their children.
a. increase b. determine
c. offer d. justify
23. as instructed, the pilot_______ followed the control tower’s directions.
a. only b. purposefully
c. concisely d. precisely
24. They decided to______ their holiday until next year due to the urgent matter.
a. postpone b. prolong
c. extend d. spend
25. He ______at the sight of blood.
a. disappeared b. recovered
c. hiccupped d. fainted