He is afraid of ___________ strangers.
#97234
A
see
B
seeing
C
saw
D
seen
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_______, water changed into steam.
#96617
A
Heated
B
Heating
C
Being heating
D
to heat
__ his telephone number or e-mail address, she had some difficulty getting in touch with John.
#94411
A
Not knowing
B
Not to know
C
Not known
D
Not having known