13. If you cheat in the exam, you could hardly _____it.
I'll spend half of my holiday practicing English and ________ half learning drawing.
September 18th, 1931 is a special day, ________, I think, that will be remembered by the Chinese forever.
—Shall I attend my friend's comingofage ceremony, Mum? —No, unless you see to ________ that you will be home before 1000 PM.
—What do you think of the 2013 Spring Festival Party? —Well, great! But I don't think much of ________ held last year.
No matter how late she comes home, she makes ________ a routine to walk her dog for about an hour.