John always thinks of others instead of himself.—So he does. It is________ of him to want to help others.[ ]

A high-tech exhibition ________in the National Museum nowLet’s go and visit it

_____ will you play basketball with me —Inabout 20 minutes after finishing my homework.

Please call my secretary to arrange a meeting this afternoon, or ________ it is convenient to you.[ ]

Use your head, _______you’ll work out the problem