Flies (苍蝇) usually live in the dirty places.
Let’s look at a fly, and see where it   27  . First, it flies out of the window,   28    it stands on   29   dirty things in the street, and then it flies back to the house and walks over your   30  .
When a fly walks on the dirty things in the street, its   31    have got some germs  32  them. When the fly walks on your food with its dirty feet, it   33   the germs on your food.
What can you   34   this?
First, we learn that we mustn’t leave dirty things in the street or on the ground near  35 . Second, we learn that all food must be covered so that flies may not   36   it. Third, we learn that flies often carry germs and we must kill them as soon as we see them.

A．walks B．stands C．lives D．flies

A．first B．second C．third D．fourth

A．some B．any C．every D．each

A．food B．drink C．cups D．bowls

A．body B．feet C．eyes D．head

A．in B．to C．on D．over

A．carries B．has C．leaves D．takes

A．study from B．study for C．learn for D．learn from

A．the factory B．our door C．our house D．a window

A．arrive B．get C．arrive in D．get to