— What’s your plan for this weekend? — We will go for a picnic by the river _______ it rains.
Jack ____ to help our Chinese teacher carry books yesterday morning.
---Do you mind if I open the door ? --- ____________.
This kind of CD-ROM is very popular. Why not buy one before it________ ?
The old man is _____ in a lonely house, but he doesn’t feel_____.
--- Why not go to see the dolphin show with me?---Because I _____ it.