We are now faced with a new problem involved in the popularity of private cars __________ road conditions need __________.
You__________the parcel home. The shop would have delivered it if you had asked.
__________annoyed him most was that he had received no apology.
—I__________some photos to be developed (冲洗). Are they ready yet? —Yes. Here you are.
Once again he failed to hand in his homework _____ he had been given enough time to do it.
. _____ the book four times, I finally understood the author's theory.