1 . 选择正确的单词或词组并用适当形式进行填空。(有两个是多余选项)

deep down,          convince,          essential,          break down,          tendency estimate,          reveal,          alternative,          approve,          digest

1. You should allow a little time after a meal for the food to __________.
2. It is __________ that smoking reduces life expectancy by around 2 years on average.
3. The changes would have to be __________ or rejected as a whole by Congress.
4. I’m afraid I have no __________ but to report you to the police.
5. Unfortunately, her marriage __________ last month.
6. Money is not __________ to happiness.
7. He seems confident but __________ he’s quite shy.
8. Yuan __________ that the answer could be found in the creation of hybrid rice.