The most obvious reason why computer-based testing is becoming increasingly popular is that it makes tests easier ______.

(2013·吉林长春高中毕业班第一次调研)As the immune system weakens, it loses the ability ________ illnesses.

My classmates, Li Ming, was highly praised for ___ a good deed.

“We can’t go out in this weather，”said Bob，________out of the window.

---We should forgive him for making such mistakes.---You are right, ______  that he is only a new hand.