There is ____ as a free dinner in this world, as the saying goes, “No pains, no gains.”

—Are you worried about his safety?—Only         .

I’m afraid we can’t come, but thanks for the invitation_________.

—How did you find your trip to Europe?—         in my life had I felt so great. The food and the service were satisfactory.

 He began to take political science_____ only when he left school.