21.
(A) vulnerable to
(B) conductive to
(C) liable to
(D) accustomed to

17. _________Taiwanese studied in Europe several years ago.(A) Not as many (B) Very little (C) More and more (D) As many as

18. In the past two weeks,_________a fistfight and a rubbery in the walkway near the elementary school.(A) there are (B) there was (C) there have been (D) there have

19. I was absent from school last week._________ ?(A) I wonder if I can lend you my class notes.(B) Do you mind borrowing me your class notes?(C) May I lend your class notes?(D) Will you lend me your class notes?

20. Which of the following sentences is error-free, based on standard written English?(A) Canadian Prime Minister Trudeau went into a long silence before responding a journalist's question about President Trump's handling of George Floyd protests.(B) We suggested, at the meeting, that the government conduct a survey of the issue to find out about the residents' opinions.(C) Sarah finally decided to serve the ice cream to her guests that she had been keeping in the refrigerator.(D) To celebrate my sixtieth birthday, I have decided to buy me the red car the BMW dealer showed me the other day.

22.(A) however(B) moreover(C) therefore(D) specifically

23.(A) extend(B) trace(C) avoid(D) promote

24.(A) familiar with(B) associated with(C) compatible with(D) contented with

25.(A) manifest(B) detect(C) develop(D) possess

26.(A) meaning(B) means(C) meant(D) whose meaning

27.(A) in(B) around(C) until(D) till