用括号内所给单词的适当形式填空。

1.  All of my classmates are in ______ (agree) that we should learn English well.

2. They enjoyed ______ (them) at Tina's birthday party.

3. My mother asked me what CD I listened to______ (recent).

4. At last the student accepted the teacher's ______ (suggest).

5. Although he got a chance to study abroad, he is ______. (happy).

国际羊毛局规定的纯羊毛标志，属下列哪类商标______

A．证明商标
B．服务商标
C．等级商标
D．防御商标