—Look! There is a big river. Let’s swim in it!—No, I think it’s _________ dangerous.
The students hurried to the classroom ________ the bell rang.
She got up early this morning _________ she could catch the first bus.
—What about this pink skirt, madam? —This one is really beautiful. I will buy it ________it's a little expensive.
I’m sorry I’m late again________ the heavy rain.
______ regular exercise is very important, it’s not a good idea to exercise too close to bedtime.