摘要：He must the muscles of his tongue and lips to produce new sounds.

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— Where is Mr. Wang?

— He is not here. He must _______ the students’ papers in the office.

A．correct B．have corrected C．be correcting D．corrects

— Where is Mr. Wang?
— He is not here. He must _______ the students’ papers in the office.

Fill in the blank according to the sentence patterns in text．

Like a scientist ________ on making a discovery, he must ________ the hope that one day he will be amply rewarded．

— Where is Mr. Wang?
— He is not here. He must _______ the students’ papers in the office.

He must _____ the south, for he likes to have rice for meal.
A. come along B. come over C. come from D. come to

— Where is Mr. Wang?— He is not here. He must _______ the students’ papers in the office.