第一节 单项选择 (共15小题；每小题1分，满分15分)
请认真阅读下面各题，从题中所给的A、 B、 C、D 四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
16. The success of "one country, two systems" in practice has been universally ______, and this policy continues to go strong.
A. acknowledged B. appreciated C. accomplished D. accompanied
17. According to the local law, no one ______ enter the building site without permission.
A. can B. must C. shall D. dare
18. By making it possible for cancer to be detected early in people with no symptoms through a simple blood test, we aim to greatly decrease cancer deaths by finding the disease at a stage ______ it can be cured.
A. which B. when C. where D. what
19. The auto factory ______ new profit records through technical innovation - 10% growth rate in the last two years and hopefully 15% this year.
A. set B. has set C. is setting D. has been setting
20. The variety of food at the restaurant is limited, but every meal can serve at least two people and is under 10, so not only is it ______ but practical as well.
A. adaptable B. adjustable C. adoptable D. affordable
21. Take the medicine right away! ______ it yesterday, you would be quite all right now.
A. Had you taken B. Would you take C. Should you take D. Were you to take