Oh, my roommate always made a mess of our living room.— . He promised to clean everything off late.

I didn’t ask for the dictionary. Why_______ on my desk—Oh, I put it there just now in case you needed whilewriting your composition.

Nick，it’s good for you to read some books ________ China before you start your trip there

Zhang Lan likes English, but she _______ maths.

Carbondioxide from burning fuels is the most common ofthe so-called greenhouse gases. A．produced B．producing C．to be produced D．havingbeen produced