“Have you seen _____ pen? I left it here this morning.” “Is it _____ black one? I think I saw it somewhere.”
——Did you inform Helen of the plan put forward at the meeting? —Of course. ________ I saw her.
Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.
She usually keeps her valuables, such as jewels and money, ________ she believes secure.
How can they expect to learn anything ________ they never listen?
—I wonder how much you charge for your services. —The first two are free ________ the third costs $30.