John began to feel little beads of sweat going down the back of his neck．His words seemed to have had no visible ___ on the man．

 Poor health does not rule out happiness except for the ______ or those in pain.

Don’t be _____ by products promising to make you lose weight quickly.

—It’s difficult to tell this picture from that one.—Yes.The differences between the pictures are very________.

Not knowing how to grow crops，the primitive people had no ______ but to gather the fruit and hunt animals for food.