My uncle works in a hospital． He is a/an_____．（ ）
| A． |
singer |
B． |
farmer |
C． |
actor |
D． |
doctor |
On January 29th， 2020，Zhong Nanshan and his team _____ over four hours online _____ five patients who were seriously ill， and made a treatment plan for those patients．（ ）
| A． |
spent；checking |
B． |
spent； to check |
| C． |
spend；checking |
D． |
spend；to check |
Is that Mary over there？
It _____ be her． She has gone to Kunming．（ ）
| A． |
may |
B． |
must |
C． |
can't |
D． |
mustn't |
It's 20 years since we came back to Liangshan．
How time flies! We _____ in our hometown for such a long time．（ ）
| A． |
work |
B． |
worked |
| C． |
has worked |
D． |
have worked |
It's dangerous for us to give too much _____ about ourselves on the Internet．（ ）
| A． |
messages |
B． |
suggestions |
| C． |
preparation |
D． |
information |
A lot of schools across China _____ starting classes because of COVID﹣19．（ ）
| A． |
put up |
B． |
put off |
C． |
put on |
D． |
put away |