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The computer / reading papers/ she/ while/was using/i was

to contact/Carlos/at home / was trying / while/sleeping/me/i was

waiting for/ got there. Her boyfriend/my sisters/was/her/when

came/was listening/they/when/I/to/the music

fell over/she/when/suddently/was walking/she/in the street

It is time every student ______ harder for the coming exam.

A. worked

B. should work

C. works

D. work