You should learn English by using it.—What ____useful advice! Thank you very much.

_____ a cold morning poor Mary went out to sell flowers. [ ]

Where is my backpack ? —It’sthe floor . [ ]

Congratulations! Among the best pictures in the competition，I found _______. Why did you draw it?一During the trip to the Yellow Mountain _______ May.

It’s important to eat a _____ diet.