Long years of hard work made _____ possible for him to enter a key university in Beijing.

 After a talk with his mother, the little boy has seen to _____ that the same mistake doesn’t happen again. 

I get the bicycle for _____.My friend gave it to me when she bought a new one.

“Have _______try, you are so close to the answer,” the teacher said to Eric.

He did’t make _____clear when and where the meeting would be held.