H.248协议包含两种注册方式，分别为：（）和（）。
参考答案：IP地址注册方式；域名注册方式
补全单词并写出汉语意思。
1. b__rd: ______
2. th__s: ______
3. 1__ght: ______
4. y__ __r: ______
— Sorry,Ann. I'm afraid that I can't attend the lecture by John Coutis with you.
— ______ Who knows when he will be back here next time?[ ]
A. It doesn't matter.
B. Do as you like.
C. What a shame!
D. Take it easy.
