In the U.S, ______a tip is thought to be polite when paying the bill. 
#91505
A
leave
B
having left
C
leaving
D
being left
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          in a white uniform, he looks more like a cook than a doctor.
#94329
A
Dressed
B
to dress
C
Dressing
D
Having dressed
—Can I smoke here?—Sorry.We don’t allow_______here.
#98519
A
people smoking
B
people smoke
C
to smoke
D
smoking
When he woke, he found himself ______ on a chair, with his hands ______ back.
#95361
A
seated,tying
B
sitting; tying
C
sat; tied
D
seated; tied