单选题

Our business won’t improve _________we offer better services to our customers.

单选题 My grandparents wrote letters to keep in touch with others _________they were young.

单选题 _________we didn’t win the basketball game, we were satisfied with our hard work.

单选题 It was the middle of the night _________the sound of the piano woke me up.

单选题 He could find the way home_________ he was only three years old.

单选题 Love your parents_________ they are alive. Don’t wait until it is too late.

单选题 _________it’s a public holiday today, some firefighters in our city are still on duty.

单选题 The story is_________ interesting_________ everybody likes it very much.

单选题 —Did you call Michael back?

—I didn’t need to,_________ I’ll see him tomorrow.