V Present Simple or Progr
unple or Progressive, Past Simple To be going to Future Sinple
My sister always ( to help to clean the house, and I usually ... (to go ) Shopping
every day. But I... (not to go ) shopping yesterday, I ... ( to be ) very tired
Today ... ( to be ) my birthday so my mother and I ( to go ) shopping now.
We... (to buy ) sweets and lemonade for the party. We... (to clean) the house
yesterday. My granny (to cook) salads now, she ... ( to bake ) a cake yesterday
and ( to put ) cups and plates on the table before the party. My friends ... (to
bring ) me presents, and I... (to be ) very happy.​

I would like to say a few words about mosquitoes. They are very nasty insects. They parasites on all living beings: people, animals. In Russia, mosquitoes are relatively harmless, although there is a huge number of them in Russia. But, in southern countries, in the tropics, mosquitoes are very dangerous. Their bite can kill a person. Theу are malarial mosquitoes...  The disease that they carry is called malaria. The mosquitoes breed on a warm time..
Mhe хотелось бы сказать несколько слов о комарах. Комары очень неприятные насекомые. Они паразитируют на всех живых существах: людях, животных. В России комары относительно безобидны, хотя их огромное количество в России. Но, в южных странах, в тропиках, комары очень опасны. Их укус может убить человека. Это малярийные комары.. болезни, которые они переносят называется малярией. Комары размножаются в теплое время...

We use these animals for different purposes. For example,  people often use dogs to looking for illegal substances (drugs). In ancient times, people used pigeons called   messenger-pigeon to exchange information. More often than not  we see dolphins water shows, this is really exciting!

People often used horses as means of transportation, and  , for example, the sheep give us   wool which we so need.

About the question "Could animals be used as secret agent?", I think it's impossible. Animals can't be used as  secret agent, because the exchange of information is impossible.