The mobile phone has changed people’s life a lot ________ it was invented.
The old man is too tired _________ go any further.
His father is __________ engineer and he works __________ research.
---Which would you like to eat, bread or sandwiches? ---___________. Please give me some dumplings.
Picking apples is __________ than having class.
Tom ______________ playing compute games, doesn’t he?