.I wonder how he could __________ not handing in his maths exercises yesterday, for his maths teacher is always strict with his students.
Someone called me up in the middle of the night, but they hung up ________I could answer the phone.
The child asked his mother go out to play tennis.
Good use that the villagers have been ________ the water resources has brought them a large income.
There was a lot of fun at yesterday's party. You ________ come,and what a pity!
My hometown has changed so much that I can't ________ it.