—Our classroom _____________ every day.—So it is. It’s our duty to keep it clean and tidy.
---- ________ class are you having? ---- Math.
I don’t like physics ______ it’s too difficult for me.
---- It’s time _____ lunch. ---- OK. Let’s _____.
There _____ a ticket, a lamp and some keys on the table.
----_____ do you _____ the book? ---- It’s very interesting.