you pay in advance, we won' t charge you for delivery.

As long as
B. As though
C. In order that
D. even though

Once customers come to rely ___ these systems, they almost never take their business elsewehere.

A. on
B. at
C. of
D. by

Detailed preparation must be ____ before your sign a contract.

A. talked
B. looked
C. carried
D. done

As your business grows, you may need (employ)___ workers with different skilss.

For (addition)resources, please refer to our website or send an email to us.