The students are ___ young people between the age of sixteen and twenty.

A good book is like a good friend. You cannot keep it          long.

 After years of changing residence (住处) and promotion, Madelyn moved to a new city and _____ became vice-president of a local bank.

--People should use public transport instead of their own private cars.--- _______.The roads are too crowded as it is.

Please drop ＿＿＿＿＿＿＿ my home when you are free.