Mary _________ as a volunteer teacher for 10 years.

Many accidents _________ by careless drivers last year .

—Excuse me, Mum. When can we have dinner? —Not until it                in half an hour.

Students _________ to use their dictionaries when they _________ an English test. 

—What does your sister usually do in the evening?—She usually______ TV, but now she _____ a book. .