The managing director demonstrated his faith （） the conscientiousness of the company's employees by allowing them to work flexible schedules.

单项选择题We would like to remind our clients that, should they have any problems （） our products, our after-sales hotline service is available 24 hours a day.

A.to
B.at
C.for
D.with

单项选择题If you wish to take advantage of our special gift offers, please （） your sales receipts to one of our employees at the promotions counter on the third floor.

A.guard
B.record
C.consider
D.present