Trả lời:
20, C
21, A - cụm worried about
22, A
23, A - look up (phrase) tra cứu
24, C
25, D
26, A - capable of (phrase) có khả năng
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27, D
28, D
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29, B - be externally employed: làm việc bên ngoài
30, C - well-off (a) khá giả = wealthy
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31, A - barren (a) cằn cỗi, khô khan >< wet (a) ẩm ướt
32, D - lost contact with: mất liên lạc >< got in touch with
~잘 공부하세요~
@su
$\text{#BTS}$