In that school,French and Russian are optional,but English is___for all students
My mother opened the drawer to _________ the knives and spoons.
Tom was about to close the windows_____ his attention was caught by a bird.
—Is it all right if I keep this photo? —_______.
Mr. Black is very happy because the clothes made in his factory have never been .
---Hey,can I ask you a favor? ---Sure, ________.