Combine the following sentences, using CONDITIONAL SENTENCES TYPE 2

II. Combine the following sentences, using CONDITIONAL SENTENCES TYPE 2.
People throw rubbish in the street. The street doesn't look attractive.
There are so many billboards in our city. People can not enjoy the view.
There is so much light in the city at night. We can not see the stars clearly.
We turn on the heater all the time. We have to pay three million dong for electricity a month.
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