Question 2 (1,25 pts): Join each of the following pairs of sentences with "or, and, but, so or because"
1. I told a joke. Nobody laughed.
2. You must study harder. You will go into another class.
3.. The city suffers from air pollution. The city suffers from water pollution.
4.. I knew her family. I did what I could for her.
5. We can't afford energy-saving light bulbs. The light bulbs are too expensive.