The world’s population is getting larger and larger, so scientists will have to ______ new ways to solve food problem.
She often _______ a white hat.
He goes to school by bus, but he walks ______after school.
I can’t play _____piano, but I play ____baseball very well. I often play it with Pat.
Jack is taller than ______ boy in his class.
---________ is it from here to the station? ---It's about five kilometers away.