—John has put forward _______ most challenging question for us to answer.—Yes, it really is. I have never heard _______ harder one.
_____ and caught the mouse.
I’ve triedveryhard to improve my English. But by no means ___ with my progress.
—My Dear! I've just missed the lecture. —That's too bad.I'm sure you it if you had got up earlier.
The naughty boy demanded that he to go on studying the next week.
_____ he realized it was too late to return home.