Two years ago, she bought an expensive mountain bike and then she persuaded me to buy _______.
| A．this | B．that | C．it | D．one |
It was not until 3 days later that the boy came back to life and explained to the police what_______ to him.
| A．was happening | B．was to happen | C．had happened | D．has happened |
U.S. President Barack Obama arrived in China’s economic center Shanghai on Sunday night, November 15th 2009, ______a state visit to China.
| A．starting | B．started | C．to start | D．having started |
There’s another way to survive this competition -- a way no one ever seems to tell you about, _____ you have to learn for yourself.
| A．one | B．it | C．that | D．another |
— Can you tell me something about _________ science.
— OK. _Nobel Prize in Chemistry is usually awarded to Americans.
| A．the; The | B．/; The | C．a; / | D．the; / |
Don’t be so upset. It won’t be ______ your children can return to school again.
| A．long before | B．long ago | C．before long | D．long |