The school has developed an on­line system________students can choose their own teachers.

The _____ look on his face showed that hehad enough confidence in himself.

What did you ________ yesterday

He’s never been to Canada before, _____ —–Sorry, I don’t know.

下面语段中加线的词语，使用不恰当的一项是（ ）石钟山上那些错落有致的奇石以及记载着天下兴衰的石刻令人叹为观止。石钟山的名字也叫得奇，围绕这一名字的由来，人们开展了激烈的争论。卷入这场争论的，有名扬四海的文人墨客，也有戎马倥偬的赳赳武夫，还有名不见经传的山野村人。无论结果如何，不容置喙的是，石钟山因此更加有名了。