139. — How did you spend you summervocation— I went to Beijing and stay there forfortnight.The underlined part probably means _____.

Make sure that your computer room is100%________of insects because they can really cause trouble to your machine

Where are__________ pens—Are__________ in the pencil box

These days lots of people are working_________ to get_________ for their living.

Seagull can’t fly far if they have no __________.