Choose the correct words. 1.Your donations could/perhaps/mustn't change their lives. 2.She can/must/couldn't get an award for her courage. She's very brave. 3.Perhaps/could /might He will need our help. 4.The situation perhaps/may/can get better if we continue our campaign. We're not sure. 5.He must/couldn't/can't be at home. He isn't opening the door. 6.Helping other people can't /perhaps/can make you feel good.7.I can't find my wallet, but it can/might /must be here sonewhere. I had it a while ago. 8.When you help a charity, you could/may/can not benefit personally, but you will feel good. 9.Could/Perhaps/Might something nice will happen to you today. 10.The government can/mustn't /may take action because a lot of people have singed the petition. ​