There are approximately 500 （） now in operation in the United States.

单项选择题Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.

A.what
B.as
C.that
D.than

单项选择题When you write, （） all the necessary information.

A.remembering to include
B.remember including
C.remember and include
D.remember to include

单项选择题Several people, （） I listed below, have not submitted their reports.

A.that
B.whom
C.which
D.who

单项选择题（） your decision to place regular orders with us, we request that you furnish us with two references for the initial purchase.

A.While appreciating
B.As appreciating
C.When appreciate
D.Because we appreciate

单项选择题The performance of the contracted product should be （） the technical specifications stipulated in the contract.

A.in compliance to
B.in conformity with
C.in accordance to
D.with respect to