knock at noe't cloor; ask sb for std; give sb sth; tell sb a

小伙,是暑假作业么?
自己查字典吧.
每个给你一句.
I was about to sleep when there was a knock at my door.
If you have any problem about work,you could ask Linda,my secretary for help.
My father gave me a computer for my birthday.
Don't forget to tell Dave about my plan when you meet him.
I'll call at his office on the chance of seeing him before he leaves.