We planned to meet at 10: 30 at the station yesterday, but Bob didn't _________ until 11: 00.( )
A.turn upB.stay upC.show upD.grow up
Have you ever worked as______volunteer during the COVID﹣19 pandemic (新冠疫情)?
Yes. It was_____unforgettable experience for me.( )
an; an
an;a
a; an
a;a
Jack's uncle has got the COVID﹣19. Now he is in a hospital.
.( )
It doesn't matter
That's all right
I'm sorry to hear that
Be careful next time
Don't get off the bus until it .( )
will stop
stop
stopped
stops
His office is on the top of the tall building. You should take a lift to the floor.( )
first
thirtieth
thirty
thirteen
The air pollution is very serious in our city. Something about it now.( )
can do
must do
was done
must be done