Most of the roads were covered with thick snow, ____ made our journey more difficult.

—What’s wrong?—I can’t find my watch      .

— Is this book interesting?— Yes, but I'm sure it won't interest         .

One of the sides of the wood board should be painted yellow, and ________.

Teenagers are warned to be careful when making friends online, because when you can’t see a person, they could be __________.