—Where did ________traffic accident happen,sir?—It took place at ________crossroads by the bank.

--What about the protection? ---Let’s keep the surface ____ dirty by putting a cover over it.

There are altogether eleven books on the shelf, ______five are mine.

.If you _______wait a moment, I’ll go and find our manager.

Carbon dioxide ___ from burning fuels is the most common of the so-called greenhouse gases.