Each member country of WTO must _____ its laws and regulations and compete on the principle of fairness and co-operation.
------ What happened to you yesterday evening? Why didn’t you finish your work?------____ the lights off, we could not continue our work. As a result, we had to leave.
The police were seeking more information to find out ____ the rich film star.
Between the two roads ____ a TV tower called "Skyscraper Tower".
A middle-aged woman came ____to the bus stop only ___ the bus had gone.
Every boy and every girl as well as some teachers who ___ to visit the museum _____required to be at the bus station at 6:30.