Everything around us is ____ solid ..liquid ____ gas.
. Please tell me how the accident _________ . I am still in the dark.
Jack always sleeps late on Sundays. I am sure he _______ when we get home.
They suspected that the secret had been________ by one of their colleagues.
The box ____ two meters by two meters and ____ a ton.
It never occurred to humans until the mid-1990s ______ some animals can be cloned.