VI
23, True
24, False
25, False
26, True
27, C - online learning (học trực tuyến)
28, A - not been allowed by the law
VII
29, efficiency
30, be
31, turning
32, reduction
33, inexperienced
34, effectively
VIII
35, Tornadoes are funnel shaped storms below a thunderstorm which pass overland.
36, The bus is such an inexpensive means of transport that people take it very often.
IX
37, Lan suggested that we should wash our hands before meals to avoid being infected with corona virus.
38, You know the man sitting next to me at the birthday party last night, don’t you?
39, The last time I was to the cinema was two months ago.
40, COVID-19 prevented us from going to school.