Ⅰ.单句语法填空
1．These gates are always open ________ the convenience of visitors.
2．Any help from you will be greatly appreciated. Please give me a reply ________ your convenience.
3．Will it be convenient ________ you to start work tomorrow?
4．Should house property tax (房产税) come ________ effect, China might witness a fall in house prices.
5．Optimism has a positive effect ________ people's physical and mental health, of which I'm very convinced.
6．He said he graduated from a famous university, but ________ effect, he never went to college.
7．One of the most ________ (effect) ways to reduce stress is to talk about your feelings with someone you trust.
8．Little Jack admitted ________ (steal) in the shop, promising that he wouldn't do that in future.
9．He studies very hard in order to get himself admitted ________ a key university.
