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21. The chairman thought ______ necessary to invite Professor Smith to speak at the meeting.
A£®that B. it C.this D. him
22. I failed in the last exam and only then __________ the importance of studies.
A. I realized B. I had realized C. had I realized D. did I realize
23. The teacher as well as the students planting trees.
A. are B. is C. has D. have
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21. The chairman thought ______ necessary to invite Professor Smith to speak at the meeting.
A£®that B. it C.this D. him
22. I failed in the last exam and only then __________ the importance of studies.
A. I realized B. I had realized C. had I realized D. did I realize
23. The teacher as well as the students planting trees.
A. are B. is C. has D. have