I’ll go camping with you, if I _____ free tomorrow.[ ]

This kind of bamboo is not suitable_____pandas _____ eat.[ ]

This is a big problem, can you ________?]

I felt it hard to keep up with my classmates. But when I want to _____, my teacher always encourages me to work harder.

They have built another new library for the students—About_____ of the books in their library are written in English．