例句： It's hard work to pump facts into unwilling students.

例句： Cubit is an ancient unit of length.

例句： I have never lost the weight I put on in my teens.

例句： Drunkenness is harmful to our health.

例句： You can't work here without a work permit.

例句： Traffic was badly snarled up near the accident.

例句： He is the undisputed champion.

例句： She is vain and foolish, and yet people like her.

例句： We rolled up to the front porch.

例句： He gave a tap at the microphone before speaking.