If it ________ for the heavy rain then, we would have arrived here ahead of time.
19.China has warned America that it_____be responsible for its arms sale to Taiwan.
18.An explosion in a coal mine in Heilongjiang on Nov. 21, 2009______at least 106 workers dead.
17.—Hi, Nancy, I didn't know you had come back. So have you graduated from college? —Yes. I______French for 5 years in Nanjing.
16.-What about going abroad?-Great, but I never expected______a chance for me before.
15.The population of China_______to many times what it was in 1949, and most of its population farmers.