How can you expect to learn anything ______ you spend all your time playing computer games?
The famous scientist grew up _______ he was born and in 1930 he came to Shanghai.
She found her calculator _______ she lost it.
You should make it a rule to leave things _______ you can find them again.
When you read the book, you’d better make a mark _____ you have any questions.
You should let your children play ______ you can see them.