Which of the following sign will you probably see in a reading room of a library?
It was not long John returned with bags of food in his hands．（ ）
until
before
when
﹣What is this？
﹣It's pencil．（ ）
the
an
a
Help yourself to some_________，Jim．（ ）
potato
fish
egg
Li Ying cleans her room the weekend．（ ）
at
for
in
﹣ you swim？
﹣Yes， I can．（ ）
Must
May
Can
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