Rewrite the sentences from active to the passive voice. My sister has already bought those fashionable shoes for her birthday party.
We have written the article about the best shopping centres in our town.
Someone stole a car in front of the city hall.
Of course they looks ugly, but they make useful things such as collecting rubbish. But also this insects have disadvantages too and this disadvantages are really very serious! The mail problem of them it's their ability to spread infections.
In conclusion i want to add that we need to overcome problems which connected with insects, but we mustn't kill them, because insects also make a lot of usefull things for us.