根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
He gave us a ________(总的) idea of the work to let us know it well.
After two more ________(过失) , the player scored a goal in the end.
The situation there ________(需要) that I should stay behind instead of going away.
He will ________(必定，无疑) join us in planting trees if he is free this Saturday.