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.