In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.

单项选择题This coastal area ______ a national wildlife reserve last year.

单项选择题Advertisements give us ______ about products, such as their prices and uses.

单项选择题—When shall we restart our business —Not until we（）our plan.

A. will finish
B. are finishing
C. are to finish
D. have finished

单项选择题In some remote places there are still very poor people who can't afford to live in ______ conditions.

单项选择题根据《水浒传》的描述，在头脑中再造出武松打虎的情景的过程，就属于( )。