Dark clouds _______ the sunlight. It seemed as if it was going to rain.

The year 1949 _____the birth of a new country---the People’s Republic of China.

3.As the years passed， many occasions--- birthdays， awards， graduations ____ with Dad’s flowers. 

This kind of tree is widely ______ in our country.

China’s economic and social development requires more substantial reforms, as unnecessary government influence on the private sector has _______ an abuse of authority.