根据中英文提示或句意，写出单词的正确形式，使句子通顺。
David hasn’t  ______________(连接) the keyboard to the computer properly.
We all know that learning foreign languages _____________(need) time and effort.
China is famous for its_____________(belonging to a time long ago in history) inventions.
Is your uncle a _____________(总的) manager of a big company?
Millie ______________(like better) singing to dancing in the past.