We don’t have enough money .We,_______, can’t afford to buy the car.
A．therefore B. so
C. however D. thus
To enjoy the scenery, Irene would rather spend long hours on the train _____ travel by air.
A.as B. than
C. to D. while
Professor Smith, along with his assistants, _____on the Project day and night to meet the deadline.
A．work B. working
C. is working D. are working
He met his previous teacher ________ at abroad.
A.by any chance B. by the chance
C.by chance D. by a chance
Tom, ______ yourself .Did you forget the school rules?
A.behave B. believe
C. perform D. conduct
He is the only one of the students who ______a winner of a scholarship for three years.
A. is B. are
C. have been D. has been
