We, ______ a discussion with the teacher, came to understand the problem better.
The scientific research on how to protect the rare animals is ________. Many scientists are working hard to find new way to raise the animals by man.
Michael __________ here to see you and he____________ a note on your desk.
—Grace, when shall we take a walk? —After I finish________ the dishes.
I really wonder____ he has posted me many parcels_____ we didn't work together.
— How come a simple meal like that costs so much? — We had ______in your bill the cost of the cup you broke just now.