As Fred cant be here today, Im going to speak().

As Fred cant be here today, Im going to speak for his part.()

As Fred cant be here today, Im going to speak on his behalf.()

As Fred cant be here today, Im going to speak in his interest.()

As Fred cant be here today, Im going to speak().

As Fred cant be here today, Im going to speakon his account.()

Forty people were killed in a ______ on the railway yesterday.

A．collision

B．collapse

C．corrosion

D．confrontation

请帮忙给出正确答案和分析，谢谢！

He feels so ______ that he stands there pointing and laughing at others, I feel like spitting at him.

A．senior

B．superior

C．supreme

D．superlative

请帮忙给出正确答案和分析，谢谢！

All the students in Miss Gaos class were asked to write a 400-word ______ about Autumn.

A．dissertation

B．composition

C．theme

D．thesis

请帮忙给出正确答案和分析，谢谢！

Under the agreement, all trade barriers between the two countries will be ______ by the end of this year.

A．abolished

B．canceled

C．eliminated

D．disposed

请帮忙给出正确答案和分析，谢谢！