______ birds use their feathers for flight, some of their feathers are for other purposes.
Once
If
Although
Because
Not until the man was out of work again going to attend a training class.
(2013)I to my cousin’s birthday party last night, but I was not available
-Any information about your son? -No,if only I ______ those tough words to him.
If only I ________ more confidence in the English speech contest held last week!
To our great surprise, the disabled person made a requirement that he as a volunteer