根据句意，用所给单词的适当形式填空
If you have difficulty _________ (learn) English， you can ask for your teacher’s help .
Our history teacher told us that TaiWan _________ (be) a part of China.
–What about going shopping at the weekend ， Ningning ？
-- The shopping mall is full of people. I’d rather_________ (stay) at home .
His           (decide) to retire surprised all of us .
His mother got even           (thin) after he failed in exam .