______ is very difficult.
Hey,Daniel.You should not drop litter so___________.
—Granny, the school trip was very exciting but a little tiring. —Oh, could you tell me__________?
---I’ll take part in the Speaking Competition next week. I’m so nervous that I’m afraid I can’t do very well. --- _____.
—1 doubt if he ___________ in the discussion tonight. —I believe if he ____________his homework, he will join us.
— I didn’ t expect to see you studying at the library so early in the morning. —________, right?