When I met him the other day,it was the first time we ________ each other since we were at school.
--- 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?
The dangerous virus ______ in the next few weeks in the laboratory can cause fatal diseases.
How can you expect him to make any progress ______ you never give him a chance to have a try?