Look out! The knife is very sharp(锋利的). You ______cut your finger.

d you please explain the assignment for Monday, Miss Smith— Certainly. Read the next chapter and come to class ________ to discuss what you’ve read.

Mark was a student at this university from 1999 to 2003, _______ he studied very hard and was made Chairman of the Students Union.

ng have you been here —About half an hour, Jack ______me here.

t” Professor Smith says, “______, let’s move on to the next part.”