In his book,he explains both ______ it means to be a scientist and ______ science works.
______ the Venice Film Festival, we are to include high-quality films, ______ who makes them.
______ it rain tomorrow, we would have to put off the sports meeting.
By the time I saw the angry expression on his face, I ______ exactly what I was having to face. But not for a moment ______ I should quit.
After his first book of poetry was published, he ______ and became famous nationwide overnight.
It was at the shopping center ______ Mary and I had an appointment ______ I lost my necklace.