I can’t imagine why he didn’t stick to his promise____he would do his best to buy me a new bike.

Where is Mr. Black I haven’t seen him for a long time.一He _________Switzerland. He _________there for several months.

We should go to the cinema early. __________, there won’t be any tickets left.

What the children in the poor mountain village need ________ textbooks[ ]

You mustn’t go off on your own, because you______get lost in the mountains.