Playing on a frozen sports field sounds like a lot of fun. Isn’t it risky, ______?

Our country will try to make greater progress in improving people's living conditions，________low­income families.

  She devoted herself ________to her research and it earned her a good reputation in her field.

 The cousins are alike in age，but ________ they are as different as day and night.

It turned out that his pulse beats ____ , which made us relieved.