单项选择题

All the people present at the conference are （） and they will discuss some teaching problems.

A.mathematics teachers
B.mathematics teacher
C.mathematic teachers
D.mathematic's teachers

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When （）,ice will be changed into water, or even steam.

A.heated
B.heating
C.to heat
D.be heating
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Mr. Johnson preferred to （） heavier work to do, such as to wash the ears.

A.be given
B.be giving
C.have given
D.give
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