to his scientific research, the professor cared little about his family.
Farmers in China began to use tractors _______ cattle for farming work.
I wonder if it is_________ for you to pick me up on your way home this afternoon.
When asked, the man that he was going to retire.
People try to avoid public transportation delays by using their own cars, and this creates further problems.
The top leaders of the two countries are holding talks in a friendly .