To keep the air clean this hospital forbids all the patients ________ in and around it.
#97677
A
smoke
B
smoking
C
to be smoking
D
smoked
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He was so careless that he left _____the door ____. 
#96839
A
leaving…unlocked
B
to leave…locked
C
left…unlocking
D
leaving…locking
First he made a list of the names of those   .Then he began to write the invitation cards .
#94606
A
to invite
B
to be invited
C
invited
D
have been invited