He can’t _____ breaking the window.
As I looked at the memorial,I thought about ________ terrible disaster it was for the people in Nanjing then and ________ they were to fight the Japanese invaders.
His parents thought only in this way ________ become successful,studying abroad.
Hearing the bell ringing,out ________.
—When can I use your computer? —Never!________ should you touch it.
I really don’t know ________ I put my wallet after I paid the bill.