根据句子意思，用括号中所给单词的适当形式填空。

61. I’ll take this white shirt. It’s much 　　　　 (cheap) than that the blue one.

62. The radio says it will be fine in the afternoon. I think it’s 　　　　 (necessary) to take your raincoat.

63. Tom was so 　　　　 (care) that he made many mistakes in his homework.

64. Now many parents make their children 　　　　 (have) different kinds of lessons during the holidays.

65. When the visitors saw the lovely pandas, they couldn’t stop 　　　　 (take) photos.

66. —Excuse me. Can I buy two tickets for the concert?

—I’m sorry you’re too late. All the tickets 　　　　 (sell) out this morning.