As far as I know, the robot that can sweep the floor ________ in the 1980s.( )
is invented
invented
was invented
has invented
Chinese people hold dragon boat races and eat _______to remember Qu Yuan on the 5 thof lunar May.( )
mooncakes
sweet dumplings
rice dumplings
fried rice
-We shouldn't worry about Mary.
-You are right. She is ______to look after______.( )
old enough; herself
big enough; herself
enough old; her
enough big; her
People invented Chinese chess in memory of the battle _______Liu Bang ______Xiang Yu.( )
neither;nor
either;or
both;and
between; and
-What are you doing?
-We are talking about the books and writers____we like.( )
that
which
who
whom
There are _____floors in the building.We live on______floor.( )
the ninth; the ninth
the ninth;nine
nine; the ninth
nine;nine