President Obama held talks with Chinese President Hu Jintao in Beijing, _____ economic recovery, climate change and stopping the spread of nuclear weapons.
I’m calling to ask for information about the position____ in the local TV news.
It has been proved ____ several new kinds of medicine____ a positive effect on the cure of H7N9.
It was the middle of the night_____ my father woke me up and told me to watch the football game.
—Is the chemistry experiment easy? —______. I’ll just do my best.
The number 5.12 is a special number,__ ,I think, that will be remembered by Chinese people forever.