I failed in the final examination last term and only then _____ the importance of studies.[ ]

You didn’t use to play tennis, ______ — Yes. I still like playing tennis now.

She thought I was talking about her daughter in fact，I was talking with my daughter

When can I use your computer—Never！________should you touch it.

It’s generous _______ him to give so much money tocharities. Now he thinks it’s important _______ him to help people in poorareas.