用所给单词的适当形式填空。 1. Mr. Wang is _________ (serious) than Mr. Zhang. 2. I think _________ (different) are not important in a friendship. 3. The students in our class all _________ (go) to the mountains yesterday morning. 4. This bag is a little _________ (heavy) than that one. 5. Do you enjoy _________ (tell) stories?