21.This is a purely _______ problem, not a political one.
22.The _______ TOEFL score for entering this program is 600.
23.The best example of a paradox is the proverb ‘More _______, less speed’.
24.This company provides a very good _______ service for its products.
25.There is more _______ in meat than in vegetables.
26.Do not _______ in the exam. This will do you no good.
27.Because of the boring _______, we need to take a vacation every year.
28.We need to _______ the purpose of the experiment again.
29.I _______ great success for my study in this university.
30.From the _______ from this examination, we know it is too easy for the students.
21.D 22.D 23.A 24.A 25.B
26.C 27.A 28.A 29.D 30.A