Mary is tired of learning because she is_____ to do better than she can, both at school and at home. 

I won’t leave my office until my work _______.

— Have you finished your project?— Not yet. I’ll finish it if I ____________ ten more minutes.

More and more people have realized that we won’t have cleaner water to drink unless something _______soon.

Mr. Li ____ to give a talk in our school yesterday.