________ the course very difficult, she decided to move to a lower level.
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.
Behind the coach ________ our team wearing blue suits.
Much ________ he has a good taste for China’s football matches,he can’t avoid being influenced by the side effects of the football gambling.