－Tomdidn’t go to school this morning, did he－______.Though he had a bad cold.

I doubt if he __________ to the party with us tonight.— I believe if he __________ his homework, he will go with us.

Susan thought ____not easy to answer all thesequestions.

He knows only _______ about American history and his sister knows even____

The work is too difficult for MrZhu to finish in a week. He needs ___________ days.