It’s difficult for the village children to cross the river to get to school. We think a bridge________ over the river
—When will she go home? —She ______ home ___ she finishes her homework.
What ____ you ______ at this time yesterday?
—I can’t find him. What should I do? —Maybe you should ____.
My watch is broken. I ask my father to ____________.
.useful invention the computer is!