—______ will the fog and haze last?—I’ve no idea. There is no sign of an end.
I had a little trouble English grammar.
—How do you improve your listening skill, Mary?—I often do it _________ tapes and English radios.
I’m new at the party and I don’t have a friend ____.
The art club is for members only. You can’t go in ____ you are a member.
Jane is so shy that she is afraid of in front of a group.