Paper ____ first ____ about two thousand years ago in China by Cai Lun.( )
A.is; inventingB.is; invented
C.has; inventedD.was; invented
Tom, I went to the party yesterday evening.
Oh, I want to know ______at the party.( )
who do you meet
who you meet
who did you meet
who you met
My grandparents wrote letters to keep in touch with others_________ they were young.( )
when
since
after
before
Sarah _________many places of interest in Beijing already.( )
visited
has visited
will visit
visits
Bob dislikes coffee, so he almost _________ drinks it.( )
often
always
never
ever
_______do you brush your teeth?
Twice or more a day.( )
How soon
How far
How long
How often