Knowing how long the test would last, the students who finished ____ back and waited until the end of the exam.
Once you want to do something, you must get down _____it well. ( )
It was yesterday _____I went to the railway station to meet my uncle. ( )
Liu Yang became the first woman astronaut in China _____into space. ( )
-What's the matter? -The cook _____five minutes ago, and there are fifty dinners still to cook.( )
Most of us_________more than one thousand English words before we came to this school. ( )