One of the girl students can _______ a model plane.

If the homework _______, you can go home.

Excellence is not difficult —simply decide right now to give it your best shot—____you will be amazed with ___ life gives you back.

After practicing for several months，I can swim much__now.

You seem to have known Dr Smith for a long time.—- That’s true. ______ he joined our club six years ago.