It’s time for class．________ the students in，please． A: A．Calls B: B．Calling C: C．Called D: D．Call

号召 A: call for B: call off C: call on D: call by

【单选题】The workers agreed to ____ the strike if the company would satisfy their demand.  A) call off B) call out  C) call to D) call on  A. call off B. call out C. call to D. call on 

No one can _________ yesterday. A: call on B: call from C: call back D: call at

I ____ your office on my way to work. A: call at B: call for C: call in D: call on

I used to ____ my teacher when I was in Beijing. A: call in. B: call at C: call for D: call on

The foreign visitors will ______the Great Wall after a short rest. A: call in B: call off C: call for D: call on

I now________ the chairman to address the meeting. A: call for B: call upon C: call up D: call out

As there was a power cut in the hospital, the surgeon had to ______ the operation. A: call on B: call off C: call out D: call for

You should ______your grandmother on your way home. A: call for B: call off C: call on D: call up