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“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”

A. must; could       B. may; might  C. need; must    D. could; need

—___John come here tonight?

   —I’m not sure, but he ______ stay at home.

   A. May, might    B. Can, must     C. Must, might     D. Can, migh

—Look at these tracks. It __________ be a wolf.

—It needn't be. It _______be a fox.

A. must ; could              B. may ; might    

C. need ; must               D. could ; need

 —___John come here tonight?

   —I’m not sure, but he ______ stay at home.

   A. May, might    B. Can, must     C. Must, might     D. Can, migh

“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”

A. must; could       B. may; might

C. need; must  D. could; need