Some aspects of a pilot’s job _______ be boring,and pilots often _______ work at inconvenient hours.

ter our country’s entry into WTO,our agricultural products, such as ______ and so on are facing more and morechallenge

Haven’t you finished your application form online—Yes. My classmates and I _____ on it for the whole afternoon.

Kitty __________ the airport in the early morning, but she still missed the flight.

sked to explain _____ he did to make hisstudents so fascinated with his lessons, the teacher paused and thought deeply