—Kevin, you look worried. Anything wrong?—Well, I __________ a test and I'm waiting for the result.
With all the books he was interested in ________, he left the library and went back to his dorm.
They suggested that the professor ________ just now ________ chairman of the meeting.
—Can you introduce me a high quality machine? —My pleasure. ________ well even on wet roads, this kind of car is very popular.
The April Fools' tradition is said ________ in the sixteenth century.
It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.