Are you going to Tom's party this weekend？
not．I may have to work．（ ）
| A． |
Probably |
B． |
Certainly |
C． |
Especially |
D． |
Properly |
Have you ever worked as______volunteer during the COVID﹣19 pandemic （新冠疫情）？
Yes． It was_____unforgettable experience for me．（ ）
| A． |
an； an |
B． |
an；a |
C． |
a； an |
D． |
a；a |
Jack's uncle has got the COVID﹣19． Now he is in a hospital．
．（ ）
| A． |
It doesn't matter |
| B． |
That's all right |
| C． |
I'm sorry to hear that |
| D． |
Be careful next time |
Don't get off the bus until it ．（ ）
| A． |
will stop |
B． |
stop |
C． |
stopped |
D． |
stops |
His office is on the top of the tall building． You should take a lift to the floor．（ ）
| A． |
first |
B． |
thirtieth |
C． |
thirty |
D． |
thirteen |
The air pollution is very serious in our city． Something about it now．（ ）
| A． |
can do |
B． |
must do |
| C． |
was done |
D． |
must be done |