A series of problems faced by the public has ______ in the national conference.
You can only be sure of __________ you have at present; you cannot be sure of something __________ you might get in the future.
A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother’s birthday.
These shoes look very good. I wonder __________.
—What did your parents think about your decision?—They always let me do __________ I think I should.
—It’s thirty years since we last met.—But I still remember the story, believe it or not, __________ we got lost on a rainy night.