When I was in primary school, I had trouble ______complete sentences.
The children are making __________. How __________ they are playing!
--- Someone is knocking at the door. Go and see who it can be.--- It__________ Peter, because he has gone to New Zealand.
My father bought the i-phone 5S two weeks ago. He ______ it since two weeks ago.
Today I will meet my best friend. We__________ each other since I left school.
Now, __________college students want to work as a teacher in our city.