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