76．I am very worried that Tom hasn’t　　　　 (回复)to my e-mail．

75．They have　　　　 (困难)achieving a balance between study and hobbies．

74．What colour can give you a happy and　　　　 (满足)feeling?

73．Last night I stayed up until l2 o'clock，so now I'm very　　　　 (困倦)．

72．The birthday present he sent me is very　　　　 (有价值)．

71．Which TV set should I choose ?It’s hard for me to make a　　　　　 (决定)．

70．旅游能帮助我们放松，让我们的生活丰富多彩。

69．为什么现在不马上开始?

68．他昨天一直在给某个人打电话。

67．你父亲已经决定戒烟了吗?