$\text{Answer:}$

$\text{31. C}$

$\text{$\rightarrow$ ct: a lack of smth: sự thiếu hụt cgi đó}$

$\text{32. A}$
$\text{$\rightarrow$ bổ nghĩa cho Đt "vary" nên ta cần 1 adv/}$

$\text{$\rightarrow$ Significantly: thay đổi một cách đáng kể}$

$\text{33. B}$
$\text{$\rightarrow$ Severity: mức độ nghiêm trọng}$

$\text{34. B}$
$\text{$\rightarrow$ There is + N số ít}$

$\text{35. A}$
$\text{$\rightarrow$ nối 2 vế mang ý nghĩa đối lập}$

$\text{36. It is the first time we have been to the Unied States}$
$\text{$\rightarrow$ ct: It is + the first time + S + have/has + V3/ed.}$

$\text{37. My car is going to be serviced tomorrow because yesterday's storm damaged it severely.}$
$\text{$\rightarrow$ ct: S + be + going + to + be + V3/ed }$

$\text{$\rightarrow$ Câu bị động vs thì tlai gần }$

$\text{38. Katarina refused to help me with my homework}$
$\text{$\rightarrow$ ct: Refuse + to V: từ chối lmj }$

$\text{39. The weather might be sunny tomorrow}$
$\text{$\rightarrow$ might tđương vs It's possible: có khả năng }$

$\text{40. It's very kind of Vicky and Tiffany to help the injured people in that devastating tsunami.}$
$\text{$\rightarrow$ It + be + adj + of + sm + to V }$

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$\text{@yev}$