5. Explain some important points
(1) call up : ring up打电话，使…回忆起
call back召唤某人回来；再访；回电话
call for 需要，要求，接（人或物）
call in 邀请；请来
call on 拜访（人）；
call at 拜访（某地）
call off 取消
Ask Ss to use the above phrases to fill in the following blanks:
① Let’s go to the meeting together ,and I’ll ______you.
A. call on B. call at C. call up D. call for
② The football match was ________ on account of the weather.
A. call back B. call off C. call in D. call for
