and, but, because

My friend plays tennis _________ football.

He walked quickly and slipped on the rock ________ he didn't get hurt.

I was absent _______________ I had something important to do.

I ran fast __________ pulled the string of my kite.

The boy was poor ____________ he was happy.

The dress was not that beautiful _________ it was expensive.

She is clever ____________ beautiful.

I passed the test ___________ I studied hard.

Cycling is good _________ I don't have a bike.

It is very hot __________ sunny today.