Could you ride a bike when you were 5 years old—_____

Michael Jackson’s personal doctor may admit the accusation if he can’t find any convincing evidence ______.[ ]

The problem with people in Africa____that the more is given and the more ______.

Why are you so happy today —Because I to London with my parents tomorrow.

Mom, can I watch T’V now— No． You ________ tidy your room first．