I can’t thank you too much for your kindness because without your help I        have won the first prize in the speech contest．

Is it the years  _______  you worked in Africa as a doctor  _______  have a great effect on your literary works? 

. The order _____the general gave was _____we must break through the enemy’s defence .

He made himself ___ in spite of his ___ English.

____is certain is ___prevention is more important than treatment .