Listen! I hear some birds ___________ the tree.A. sing in B. singing in B. sing on D. singing on
I will do some cleaning as soon as I________my homework.
I wanted to help my mother do the housework.She asked me to________the rubbish.
—Could you please help me sweep the floor? —________.
—Could I use the phone,Miss Li? —________.
Here are some books.Could you please________?