--Has Tommy finished his project yet?--Maybe not. He ___on it at lunch time. Let's go to have a look now.
—There is a large beautiful bridge ___ the river in this town
Kate is not good ___ English but she does very well __ Biology.
It was very silly ___ you to take in what he said. He is a liar!
He suddenly return ___ a stormy night.
__________! There comes a train!