Mum didn’t go to bed _____ I came back home last night.
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.
Jim______ to the shop. He’ll be back_____ an hour.
---Jack likes playing ______ chess, but he doesn’t like playing_______piano.