1. I wonder _________ he will be here tomorrow.
if
if / whether
whether
2. Let me know _________ you pass the test or not.
3. Is the shop open? Phone me ___________ the shop is open.
4. You must decide on __________ to work here.
5. Is the shop open or closed? Phone me ___________ the shop is open or not
6. I'll travel to England __________ I have money.
7. I'll travel to England __________ you're coming or not.
8. I'll go out ___________ or not it rains.