49. People believed that the government was carrying out a big project in Hanoi.
A. It is believed that the government was carrying out a big project in Hanoi.
B. It was believed to be carrying out a big project in Hanoi by the government.
C. The government is believed to be carrying out a big project in Hanoi.
D. The government was believed to be carrying out a big project in Hanoi.
50.They have worked in that company since 2001