While____the dog,you should take care not to____.Otherwise,it may be dangerous to strangers.
Mrs.White showed her students some old maps ______ from the library.
I have seldom seen my mother _______ pleased with my progress as she is now .
Mary made coffee ________ her guests were finishing their meal .
As a child , Jack studied in a village school ,_____ is named after his grandfather.
I’ll spend half of my holiday practicing English and _______ half learning drawing.