He _______ more than 5,000 English words when he entered the university at the age of 15. [ ]

It’s too bad that I failed in the math exam. If only I ______ hard at it!

You should tell ______________ possible to support your ideas．

下列句子属于议论的表达方式的一项是

An agreement seems to be impossible because the majority of the committee members are ________it.