160, D - became (câu điều kiện loại 2: If + S + V-ed /V2, S + would / could / should + V1)

161, B - froze (câu điều kiện loại 2: If + S + V-ed /V2, S + would / could / should + V1)

162, B - preservation (n, sự bảo tồn)

163, B - protection (Animal protection supporters: những người ủng hộ bảo vệ thực vật)

164, C - survival (sự tồn tại, sự sống còn)

165, C - who painted

166, B - is released

167, A - where

168, B - whose

169, A - That Phillip Glass

170, C - most of which

171, C - whether life

172, A - have revolutionized

173, B - do we see

174, D - in which the birds live

175, C - living

176, B - which is considered

177, A - organized

178, D - must be banned

`color(green)(160D)` 

`color(green)(161B )` 

`color(green)(162B )` 

`color(green)(163B )` 

`color(green)(164C )` 

`color(green)(165C )` 

`color(green)(166B )` 

`color(green)(167A )` 

`color(green)(168B )` 

`color(green)(169A )` 

`color(green)(170C)` 

`color(green)(171C )` 

`color(green)(172A )` 

`color(green)(173B )` 

`color(green)(174D )` 

`color(green)(175C )` 

`color(green)(176B )` 

`color(green)(177A )` 

`color(green)(178D )`