46. He got excited at the news，________ I was calm. A. when B. while C. because D. after 47. Shall Brown come and play computer games? No，________ he has finished his homework. A. when B. if C. unless D. once 48. Hardly had he arrived in Hongkong ________ she rang me up. A. when B. than C. that D. and 49. ________ they heard the shout for help，they rushed out. A. Immediately B. The moment C. The while D. All the above 50. ________，he never seems able to do the work beautifully. A. Try as he may B. as he tries C. Try as does he D. As he does try
