ad becomes so crowded during rushhours, ______ it becomes a very slow route

The police are trying to find out the ____ of thewoman murdered in the bathroom

The children went home from the grammar school,their lessons___for the day.

The prediction from Maya worries residents _______ December 21, 2012 would be the end of the world

The US is China’s biggest export market, ________ more than 70 percent of China’s exports.[ ]