Paper _____ in ancient China more than 2,000 years ago.
invented
was invented
invent
is invented
Sally's favorite _____ is orange.
I see.That's why all her sweaters are orange.( )
fruit
color
juice
That's the boy ____ won the first prize in the competition yesterday.( )
who
which
whom
We all look forward to ____ you again soon.( )
see
seeing
seen
Do you know ____ ?( )
how old is he
how old he is
he is how old
My sister ____ be lazy. But now she's working really hard.( )
used to
is used to
was used to