By the time Billy was 6, he in the sea.
No driving after drinking is a rule that every driver ______ obey in our country.
Restaurants in every corner of Tianjin not only provide job opportunities but ______ lots of taxes.
--- When did you last see your first teacher?--- On ______ Friday last June, at ______ celebration of her 40th year of teaching.
Father made a promise ______ I passed the exam, he would buy me a PS4.
--- Alex came back home the day before yesterday.--- Really? Where ______ at all?