Half of the class _____ done most of the work ．The left _____ rather difficult．

Will your father be back home in two weeks—Maybe, but I’m not ______

Which color do you prefer, red or black? —Red. For red_____a sense of energy and strength.

These boxes are too heavy for me to move— Here, I’ll give you a hand ____ them

Neither the students nor the teacher _______ the way to the Summer Palace.