1. You can get or transmit a disease through specific means and activities.2. Infectious diseases are transmitted from person to person by direct or indirect contact.3. Can you infect someone with HIV days after you are infected with it?4. I got a cold a week ago, and I gave it to my family. Now they are all sick.5. Is cancer contagious?
 transmit a disease infect somebody with a disease give a disease contagioustransmit a disease = 把某病傳染給別人infect somebody with a disease = 把某病傳染給別人，infect 常用在性病give a disease to somebody 常用在一般感冒contagious = 形容一個疾病可以傳染給別人
I have been wrecking my brin on this tough math question but I still cannot solve it.