用所给单词的适当形式填空。 1.Every year, many ________ (tour) go to Zhalong to watch birds. 2.—Is drawing as difficult as swimming ? —No, it's much ________ (easy), I think. 3.The children always enjoy ________ (they) at the weekend. 4.Speak louder, please. I can't hear you ________ (clear). 5.Tigers are ________ (protect) animals. We can't hunt them .