Helen always helps her mother even though going to school_______ most of her day.
— When could you have a meal with me? — I'd like to go ___ it is convenient to you.
— Who are you going to have _______ this letter for you? — My secretary.
Not others but Mother always _____ children ______ in their beautiful clothes.
The West Lake we visited last year was really_____ attraction and we'd like to visit it _______ second time next year.
He ________ in American for five years, and now he works in Shanghai.