Jack’s grandfather ________for more than twenty years.
— Could you tell me ______? I must find him.— Sorry. I have no idea. But he was here just now.
If you keep on working hard, I have no doubt ___ you’ll be successful in the future.
She devoted as much time as she could _______ others.
Many butterflies are still ____ after the long winter days. Now the forest is ____.
Cheer up and keep on trying. Courage is doing ______.