Sun Hai his mother make dinner when his father got home from work.( )
A.was helpingB.helps
C.helpedD.is helping
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.( )
spent;checking
spent; to check
spend;checking
spend;to check
Is that Mary over there?
It _____ be her. She has gone to Kunming.( )
may
must
can't
mustn't
It's 20 years since we came back to Liangshan.
How time flies! We _____ in our hometown for such a long time.( )
work
worked
has worked
have worked
It's dangerous for us to give too much _____ about ourselves on the Internet.( )
messages
suggestions
preparation
information
A lot of schools across China _____ starting classes because of COVID﹣19.( )
put up
put off
put on
put away