It is______ a sharp knife ______I can use it to cut open a hard pumpkin.[ ]

David is clever and quick at work,he is honoured with the title of model worker.

It’s easy ______ a banana milk shake. Let me help you.

Lucy is ________ university student. She likes playing _______ piano.

Yesterday I lost my pencil sharpener. I couldn’t find_______.—Oh, it’s a pity. You’d better buy ________ this afternoon.