He walked directly towards her, and spoke to her in a low voice to avoid _____ by others.
#90220
A
to hear
B
hearing
C
to be heard
D
being heard
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Our school forbids_____ ,that is to say, we are not allowed ____ at school.
#96871
A
to smoke, to smoke
B
students’ smoking, smoking
C
students’ to smoke, smoking
D
students’ smoking, to smoke
Tom’s brother who is now a doctor always encourages        hard and go to college. 
#94511
A
for him studying
B
him studying
C
for him to study
D
him to study