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.