---- Where is mother? ---- She is in the kitchen. She ______ the housework all morning.
I have many friends,some are teachers.
The plane ________ when I arrived at the airport.
_____ is a possibility _____ Tom will get first place in the long jump.
He is ________ experienced teacher in our school.
At present, you do meet with some difficulty in English learning, but you will have a good knowledge of it.