单选题 Broadband connections are widely available now, ___ makes online shopping much easier.

单选题 She ___ quite sure that she ___ the door before she left the office.

单选题 In fact, there are different reasons ___ people are working long hours.

单选题 The manager decided to continue the sales for ___ two weeks because of the large stock of goods.

单选题 Please feel free to tell us ___ you think about our program so that we can benefit from your views and experience.

单选题 ___ great losses in the financial crisis, the company closed down last year.

单选题 We don't have to hurry as the bus ___ for London at five in the evening.

单选题 You have to work in this position for two years ___ getting promoted.