His shoes are muddy. He        be working in an office all day.

That children ______meet with setbacks is a matter of necessity as they_____, so parents don’t worry about that.

--It is really fun to hike and I often go hiking in the forest.
--But hiking alone in the forest ______ be very dangerous.

According to the newly-made traffic regulations, ____drives through the red light ____be fined at least 200 dollars.

Sir, you_______ be sitting in this chair! It is just for women with children and old people only.

---Could you please tell us some good ways to learn English well?
---My suggestionis that reading often and writing regularly_____
be needed

If you work hard and finish it this week, you _______ have Monday free next week.

Facebook has become one of the most popular social websites. Its founder    ___________when he started it years ago.
A could never imagine it     B must have never imagined it 
C must never imagine it      D could have never imagined it

You _____ all those clothes! We have a washing machine to do that sort of thing.                                                      

If you _____ smoke, please go outside because this is a non-smoking office.