1. Make up the sentences using the Passive Voice.
1) These documents (must sign) today.
2) This work (could finish) a week ago.
3) Dictionaries (can not use) during the exam.
4) The application (must fill in) with a pen.
5) The sick child (should examine) by the doctor.
6) The photocopier (may use) by anyone.
7) This story (should not tell) to little children.
8) Mobile phones (must not use) during a flight in airp
9) The dog (should take to the vet.
10) The parcel (could not deliver) yesterday.
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.