You never know how much difficulty we had _____ the problem. Luckily, we managed to solve it with Mrs Wu’s help
There are ________ of students in our school, but only ______ are girls.
It’s very nice ________ pictures for me.
The little girl didn’t know ________ story.
You can find ______ island and an old man lives there ________.
---How soon will you finish your college? ---________.