Tom’s mother is too busy _______ housework _______ him with his homework.

301 In the middle of last century planesbegan to be used to transport both passengers and goods The underlined wordsmeans ____

The young man has never been toHong Kong, _____________

Where were you at eight yesterday evening—______.

Can you tell me how many study groups there are in a class?— Generally speaking, a class often ___ 8 study groups, each with 7 group members.