$\text{1.}$ If we pollute the air, we will have breathing problem.
$\text{→}$ Câu đk loại 1: If + HTD, TLD
$\text{2.}$ Because it is raining very hard, we won't go on a picnic tomorrow.
$\text{→}$ Because: bởi vì
$\text{3.}$ She is keen on reading comic books.
$\text{→}$ be keen on + V-ing: ham mê
$\text{4.}$ She enjoys raising money for the poor.
$\text{→}$ enjoy + V-ing: thích thú
$\text{5.}$ He was tired, so he went to bed early.
$\text{→}$ so: vì vậy
$\text{6.}$ I find carving eggshells difficlut.
$\text{→}$ find + V-ing/ N + adj
$\text{7.}$ Unless she learns harder, she can fail the exam.
$\text{→}$ Unless = If not
$\text{8.}$ I have collected stamps for 3 years.
$\text{→}$ S + started/ began + V-ing/ to-V + time = S + have/ has + Ved/ P2 + for/ since
$\text{9.}$ Nick's hobby is carving eggshells.
$\text{10.}$ He is not keen on eating fish.
