I ______ tell you with certainty that he won’t be able to finish it before the deadline. 

– Who didn’t turn off the light after school yesterday?– It ______ be Lucy. She told me she was the last one to leave the classroom.

—Would you like some______?—Thank you, but l don’t like it.

 She is a quiet girl at school，but sometimes she _____ be very naughty.

— Shall we take a taxi? — No, we         . It’s not far from here.