How long do you think ___________ the Microsoft brings out a new product?
I often have conversation with John over _____ phone, but keep in touch with Tom by writing _____ letters.
Whenever I was in trouble, he would do what he could _____ me.
The speaker raised his voice but still couldn’t make himself ______.
You ____ television.Why not do something more active?
She is my best teacher ______ help I have made great progress.