. Mary _____ be in London because I saw her in town just now.

nd has decided to begin building its first standard-gauge railways in cooperation with China, ______may cost $12.2 billion.

The South Pole isn’t _____ people could find a comfortable place to live, for the average winter temperature there is below-40℃.

joy, Della first earned the trust of herstudents and then _____ of her colleagues

Mayor will make an inspection of our school on Monday, ___ you can tell him how hard the situation we are in