Though _____ in Germany, Henry was brought up in Jinhua by his aunt.

________ on ten years of observation and study, Professor Wang announced that everyone dreams every night，whether they realize it or not.

____ the main idea of the text, and you will be able to answer the question.

Many developed countries have agreed to help the less developed ones but it remains ________ whether they will take action or not.

The real secret to successful learning lies in students＿＿＿＿an interest in what they are doing.