I think _ is impossible for me to climb such a high mountain.A. it B. this C. that
The woman can't__________his son in the park.
Although they feel tired,__________they still go on working.
When I spoke English,people there always laughed _________me.
—Why did you quarrel with your mum? —She was always _________ a little guy.
Why don’t you _________your teacher for help?