21. We put ______ a new plan but the key is who will carry it ______.

A. forward; out    B. up; out      C. on; through     D. forward; on

22. ________ the cost, the project will take a lot of time as well.

A. Other than      B. Except for         C. In addition  D. Apart from

23. Nowadays searching information on the Internet is a piece of cake. The ______ is how you can tell if the information you get is beneficial or not.

A. characteristic    B. competition               C. challenge                    D. confusion