$\text{21.}$ B

$\text{→}$ help sb with sth

$\text{22.}$ B

$\text{23.}$ B: nhìn xuống

$\text{24.}$ B

$\text{25.}$ B

$\text{→}$ think about sth

Level A2:

$\text{26.}$ D

$\text{→}$ look after = take care of: chăm sóc

$\text{27.}$ C

$\text{28.}$ A

$\text{29.}$ D: đột nhập

$\text{30.}$ A

$\text{31.}$ B

$\text{→}$ turn up = arrive: đến 

$\text{32.}$ A

$\text{→}$ look like = take after: giống

$\text{33.}$ B

$\text{→}$ try out = test: thử

$\text{34.}$ C

$\text{35.}$ B

$\text{36.}$ B: đảm nhận

$\text{37.}$ A

$\text{38.}$ C: mất

$\text{39.}$ C

$\text{40.}$ C: tham gia

$\text{41.}$ C

$\text{42.}$ B