After long and hard struggle, his small family business began to _____.  Hopefully, it will change into a large firm in the near future.

It’s hard to rescue drowning people because they ________ so much. 

 The time Dr. Wang has devoted _____ the disabled in the past five years is now considered_____of great value.

Scientists think they have _____ in their attempt to find the causes of some major dieases.

If you can ____ a second, I’ll look for Bob and tell him you are on the phone for him.