Thailand has decided to begin building its first standard-gauge railways in cooperation with China, ______may cost $12.2 billion.
I saw him leave the office an hour ago . He ____ at this time .
You don''t look well . You ____ have a fever .
He studied hard and ____ pass the examination .
The money was soon spent , so he ____ go hungry .
— Would you open the window , please ? — Yes , I ____ .