1. If you want to catch that train, you’d better _______ _______ (出发) for the station immediately.
2. When she _______ _______ _______ (往……外看) the window, she saw her father was still there. 3. I’ll do it, _______ _______ (即使) it takes me all the afternoon.  
4. “Please take my seat, grandpa. I’m          ___ _______ (下车) at the next stop,” Tom said to the old man.  
5. —Where does the Earth’s energy _______ _______ (来自)? 
    —Most of it is from the Sun.