单选题 We are ____ a loss to understand why we haven’t heard from you.

单选题 ____ your schedule permits, we would like to invite you to dinner.

单选题 We have arranged ____ your transportation ____ the city.

单选题 Our company offers a wide ____ of computers.

单选题 He is planning to make a business ____ to Vancouver next month.

单选题 We are pleased to draw your ____ to the enclosures below.

单选题 ____ reply to your inquiry, we are glad to respond as follows.

单选题 We are looking forward to ____ cooperation with you