When travelling in buses or trains, we are likely to have conversations _____ we give information or opinions about different things.
I am badly off. If I ______ money, I ______ a large house.
Only when I left my parents for Italy _______ how much I loved them.
It was not until midnight _________ they reached the camp site.
— Did you meet with the famous space hero? — ___________ I had come here earlier.
The committee ______ five famous scientists put forward a valuable plan at the end of conference.