The boy looks nice ______ white and the red sweaterlooks good ______ the girl .

Did you get WeChat red during the Spring Festival—Yes, It’s _______ the most popular way of sending holiday gifts in China now.

Mr Green didn’t understand ________ made his daughter so absent-minded this morning

, he often shows sympathy the poor.

been puzzled over the problem for over an hourwithout any result, ____ all at once the solution flashed across my mind