--Are you satisfied with the air today? --Not at all, it’s so foggy that I often get a cough. I think we all need much ________air to breathe.
You can ________ in a parking lot.
Jack likes to sit ________ the back of the bus.
---- What are you doing?---- I’m ________ my English book.
I borrow a book from my friend and I can ________ it for a week.
---- ________ class are you having? ---- Math.