Complete these sentences with the verbs in brackets in the correct active or passive Infinitive-form.1) The situation is serious, he is addicted to drugs. Something must (to do) … before it’s too late.2) It’s not certain how the fire started, but it might (to cause) … by an international action of a robber.3) Don’t you think that more money should (to spend) … on labour colony.4) I haven’t received the letter. It might (to send) … to the wrong address.5) The prison is in a very bad condition. It should (to repair) … a long time ago.6) The injured man couldn’t walk and had to (to carry) … from the place where the accident happened.