Besides Tom, ________ Crosettes have two other sons, __________ of whom are all interested in making model planes.
- You must have missed the last train to Guangzhou the other day. - Oh, no, I _____.
The accident has reached a point _____ the police have to be called in.
As a new graduate, he doesn’t know ______ it takes to start a business here.
Do you know ____ or not Maggie will go to the cinema with us tonight?
Do swim with others. Otherwise, you _________.