If a substance has a higher density, ____ 2, 000kg/ m³, it will not float on water.
--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.
---Spacecraft “Discovery” has failed in the course of launch. ----_______? They have been preparing for the test.
--I didn't know this was a one-way street, officer. -----__________________.
He arrived here at noon, ________in the day, and he went out and came back ________in the day.