______did the rainstorm come， Mr． Liu？
While we_____a chemistry lesson yesterday afternoon．（ ）
| A． |
When； have had |
B． |
When； were having |
| C． |
While； are having |
D． |
While； have |
is necessary for us to wash hands when we are back home．（ ）
A．ItB．ThatC．This
China is famous its long history．（ ）
A．atB．inC．for
Nowadays， Xiangtan is nice city to live in． （ ）
A．aB．anC．/
Could you tell me_____ in Wuhan， please？
Maybe last December．（ ）
A．when did Covid﹣19 （ 新冠肺炎） break out
B．when Covid﹣19 broke out
C．how often Covid﹣19 breaks out
When does the online class begin， Mrs．Grace？
At eight o'clock． Tell Cindy________late．（ ）
A．not beB．not beingC．not to be