The last time we had great fun was __________ we were visiting the Water Park.
How can we ____ all these flies in the kitchen?
If you ____ do as I tell you , you ____ go to the party .
Li Ling was a diligent boy . He ____ go to school though it was raining hard .
The work ____ be finished in such a short time .
— ____ he open the door ? — Yes , please .