Dream of the Red Chamber is ________worth ________because we can learn a    lot about the noble families in the feudal society.

We used to see each other ______,but I haven’t heard from him since last year.

Drunk driving used to occur ________ in our city，but now such cases are rare.

—— How did you find your visit to the museum? —— I thoroughly enjoyed it. It was＿＿＿＿interesting than I had expected. 

—“Could we put off the meeting?” she asked. —“ ____ ,” he answered politely. “This is the only day everyone is available.”