Tom was caught cheating in an important exam _____, he lost a golden chance of taking part in this competition[ ]

You have failed to do what you ________ to and I’mafraid the teacher will blame you.

here is my toy car You promised–_____, my dear, but you know mum is pretty busytoday Tomorrow, OK

I’m not getting on well with Jim recently. — ______ he didn’t show up at your birthday party the other day.

下列各句中，加点的成语使用恰当的一项是（ ）