They arrived at a farmhouse，in front of ________ sat a small boy.

Jenny, how many years have you studied in China?— I ________ here for three years by the end of this month

I have__________ classes this morning. The ___________ class is English.

It’s everybody’s desire that every effort___________toreduce the pollution in our city.

I __________ there little more than a week when I set to work with the scientist