The lack of eco-friendly habits among the public is thought to be a major _____of global climate change.
—How are the peace talks between the two countries?—We are looking forward to hearing the final .
After the flood, all the emergency workers around the clock in case the dam burst.
—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.
The country has already sent up three unmanned spacecraft, the most recent__at the end of last March.