Who is at the door？
A deliveryman（快递员） or wanting to sell his new products．（ ）
A．everybodyB．anybodyC．somebodyD．nobody
Tom． together with his friends， often________ to the old people's home to cheer the old up．（ ）
| A． |
go |
B． |
going |
C． |
goes |
Look at the sign "No swimming"， it warns us ________ in the lake．（ ）
| A． |
to swim |
| B． |
not to swim |
| C． |
swimming |
In February， 2020， many doctors and nurses ________ to Wuhan to save the patients．（ ）
| A． |
was sent |
B． |
were sent |
C． |
are sent |
There ________ something wrong with my mobile phone． It can't work these days．（ ）
| A． |
must be |
B． |
can't be |
C． |
may be |
________ you keep moving， you'll never reach the top of the mountain．（ ）
| A． |
If |
B． |
Although |
C． |
Unless |