This English story is quite easy for us to read. There are ________ new words in it.

_____ how mirrors produce image, we need to know what light does. [ ]

Don’t worry. You’ll soon get used to ___ inthe country.

All the students are cleaning. ________ are cleaning thefloor, and ________ are cleaning the desks.

It __________ Tom that parked the carhere, as he is the only one with a car.