—Please ________ to return my book by Friday.I’ll use it on Saturday.—No problem.I’ll finish reading it on Thursday.
________ your umbrella with you.It is going to rain.
English is not easy,________ I like it very much.
Don’t forget ________ an umbrella ________ you.It’s going to rain.
Our desks are made ________ wood,and paper is made ________ wood,too.
We must save the elephants because they are ________.