一种物质能发生分解反应，则该物质一定不是

从方框中选择最佳选项完成对话, 有两项多余。

a. What should I do?

b. It's wonderful.

c. Could I join your group?

d. What's wrong?

e. I'm sorry to hear that.

f. How do you learn English?

g. Tomorrow if you like.

Tom: Hi! Alice, you look so sad. ____.

Alice: I failed in the English exam.

Tom:____But you don't need to worry about it all the time.  

Alice: I really don't know how to study English well.____

Tom: I think you'd better study with a group.

Alice: Oh, that's a good idea.____

Tom: Certainly. And we can learn from each other.

Alice: Sounds good. When can I join you?

Tom:____

Alice: That's very kind of you.

①南极大陆有丰富的煤炭资源

②荷兰国土的20%是人工填海造出来的

③南美洲大陆凸出的部分与非洲大陆凹进的部分几乎是吻合的

④大陆的形状大多是三角形的．

The girl is too young. She can't ________ herself now.