choose the correct answer

I'm not happy... (because/so) I started a new school last week. I haven"t got any friends. Please tell me how I ..... (can/should) make a new friends.

I (can/can't) understand my homework. I need help. What... (should/can't) I do

I .... (should/have) to share a room with my brother. He's very untidy.

.....(have/should) I tell him to tidy his part off the room?

My sister (have/has) to walk her dog. She doesn't like the rain (so/because) she always wants me to do it when it's raining.