---- What ________ great fun it would be if we could light candles to celebrate his birthday!---- Forget it! The teacher in ________ charge of our dorm won’t be happy to see that.
Look out! Don’t get too close to the house the roof is under repair.
Is some American friends visited last week?
. After two hours of walking, they came to the camp site, ______ .
. —______ that he managed to get the book? — Oh, his sister helped him.
The reason______ he was late for class is______ he didn’t catch the first bus.