.— Has Tom finished his report so far? — I have no idea.He ______it this morning.
Their tent,__________ light as a feather, remained firm in the storm last night.
Why haven't you finished your homework yet? You___________ to have finished it by last Sunday.
Could you give me a hand __________from the car, please?
--I'm told that John had another car accident this morning.--I believe not. He _________so careless.
The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.