| A | B |
| to challenge | to call to a halt for identification; to call into question; to call or dare to take part in a duel |
| To create | to cause to come into existence; to bring about give rise to cause |
| To chart | to draw, to map out, to list in a special order |
| To complete | to end , finish, conclude; to make whole, full, or perfect; to successfully execute or effect |
| To calculate | to find something by adding numbers together |
| To confuse | to make someone feel that they do not understand something |
| To contact | to telephone, write, talk, or e-mail someone |
| To contrast | to compare two things that are different |
| To contribute | to give help; to be a part of a project |
| To criticize | to say that someone or something is bad |
| To cluster | to form a close group |
| To coax | to try to get someone to do something by talking to them gently and |