He knew his daughter was crying ____ what he had said.

There is no doubt _____ he will finish the task in time.

After designing more experiments,they were able to clarify the procedure　　 bees communicate information that they use to find and fetch food.

 I don’t think he will make a superstar like Cristiano Ronaldo. He just lacks         it takes to be a professional soccer player. 

Ａlot of language learning,       has been discovered, is happening in the first year of life, so parents should talk much to their children during that period.