________ 200BC, the Silk Road, which was the route for trade between the East and the West, was in use.
No matter how frequently _____ the works of Beethoven always attract a large number of people.
Under no circumstance _____ to tell lies to parents.
"_____ your meeting is!" he offered them his sincere congratulations.
From my point of view,the theory thatby the scientist is not quite scientific.
Tom’s mother often requires that hemore time in studying English every day.