——Hey, can I ask you a favor?----Sure, _______
There was a time __________ the people in my village lived a peaceful life, enjoying the beauty of nature.
I’m amazed to get in touch with my deskmate of Junior Middle school again. __________, it is ten years since we met last.
The chairman thought __________ necessary to invite Dr. Smith to speak at the meeting.
This is the first time I __________ to the capital to attend the celebration ceremony.
According to a new study by a British university, learning __________ second language can lead to __________ increase in your brain power.