20．-It was a red light，William．You　　　 the car

　　 -Sorry．I didn’t see it．

　　 A．must stop　　　　　　 　　　 B．should stop

　　 C．must have stopped　 　　　　 D．should have stopped

19．It was not until she had arrived home　　　 her appointment with the doctor．

　　 A．when she remembered　　　 　　　　 B．and she remembered

　　 C．did she remember　　　　　 　　　　 D．that she remembered

18．Dorothy was able to switch between German，Polish and Russian，all of　　　 she spoke fluently．

　　 A．whom　　　 　　　　 B．that　　　 　　　 C．which　　　 　　　　　 D．them

17．Early this year，cruel snowstorms hit southern China，　　　 great transportation　　　 problems in some areas．

　　 A．causing　　 　　　　　　 B．caused　　 　　 C．to cause　　 　　　　 D．having caused

16．-I wonder if you could go with me to the cinema

　　 -Don’t disturb me．I　　　 a composition all the morning and haven’t finished yet．

　　 A．write　　 　　　　　　 B．was writing　 C．have written　　 　　 D．have been writing

15．Why not get some work experience first　　　 go straight on to university?

　　 A．or rather　　 　　　　　 B．other than　　 C．more than　　 　　　　 D．rather than

14．The photos on the wall　　　 Grandma of those happy old days when a large family　　　 lived together．

　　 A．repeat　　 　　　　　　 B．remember　　 C．remind　　 　　　　　 D．retell