The telephone ______ by Bell in 1876.( )
will be invented
is invented
was inventing
was invented
To feed her little son. Mrs. Smith has to _______ the vegetables and meat.( )
make up
put up
set up
cut up
As far as I know, the robot that can sweep the floor ________ in the 1980s.( )
invented
has invented
The man _______ be a doctor in this hospital, but I'm not sure.( )
must
would
can
might
Ling ling, you'll feel sleepy tomorrow _______ you go to bed early.
OK, Mom. I'll go to bed at once.( )
if
unless
though
because
Frank is an honest boy and he never tells a lie. We all _______ him.( )
miss
mind
doubt
trust