单项选择题

A．To invite him to attend a seminar.
B．To inform him about some changes in the arrangement for his seminar.
C．To invite him to visit the lab.
D．To inform him that the seminar has been postponed.
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单项选择题
A．4.B．8.C．5.D．18.
A．4.
B．8.
C．5.
D．18.
单项选择题
A．They have just won the spelling contest.B．They have just won the composition contest.C．They have just won the speech contest.D．They have just won the vocabulary contest.
A．They have just won the spelling contest.
B．They have just won the composition contest.
C．They have just won the speech contest.
D．They have just won the vocabulary contest.
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