Don’t put the waste on the ground—Oh, I’m very sorryI ________ the dustbin（垃圾箱） there

Many of them turned a deaf ear to his advice, _______ they knew it to be valuable

Shall we go and ______ hello to the oldman—Good idea! Let’s go.

he Internet is of great help, Idon’t think it ‘s a good idea to spend too much time on it.

The work _____ in three hours . Let’s hurry.