Eye doctors recommend that a child’s first eye exam ________ at the age of six months old.                    

One of the characteristics that make me different from many people is my adaptability—I'm _______ and comfortable in new or unusual situations.

The monthly sales of Mo Yan's works ________ 199 times compared with those before he won the Nobel Prize for Literature.

 Frequently, single—parent children       some of the function that the absent adult in the house would have served . 

----Mr. Johnson, would you have some more ice-cream?----No, thanks. It’s very good, but I have to _____ my weight, you know.