Can you tell me_____ difficult the exam turns out to be?

People should stop pouring dirty water into thelake.— _______. It will cause pollution.

I’mBob. What’s your name —Mary. How are you A.My names B. My name’s C. Hisnames D. His name’s

She dinner when there was a loud knock at the door.

It’s not necessary to explain the truth________ there are air, water and sunlight , there are living things.