A.Where | B.When | C.What |
There are lots of 1.f______ in the city. We can often see the black 2.s______ out of them. It makes the 3.a______ very dirty. Some people 4.f______ ill. They can’t jog in the 5.s_______ in the early morning.
A.use, much | B.used, much | C.use, many |
A.an | B.a | C.the |
A.at | B.on | C.to |