Now that you have a job, you must exert (努力) yourself in ______ you do at work.

Why does Sara know so much about Angkor Wat?—She ________have been there, or …[ ]

_______ the extreme levels of air pollution, city authorities have started to take measures to quickly reduce pollution levels and protect city dwellers.

ng as its special effects are ________, there istoo much violence in the film.

How dangerous! She was driving the car with one hand and holdingan ice cream with_____.