Trees provide food and shelter and make us ______ comfortable.

It is important for us _____ our English. 

There _____ still some milk in the fridge. It’s not necessary to go to the store today.

Tom, you’ve got an “A” in the maths exam. How I ______ you!

 --- Mr Li, I can’t understand everything in class.--- Don’t worry! I’ll _____ _ the main points at the end.