15A world-famous ballet company’s 42-year absence from Beijing will end 　it brings a new production to the stage this week

The old lady is said to have three children，two of ____studying abroad.

. The school has recently decided that students aren’t permitted to use mobile phones at school, but I find it difficult to _______ this decision..

Kate spent her childhood in New York. Is it true? — No, it was in London _____ she spent her childhood. [ ]

It is reported that the number of students_______ computer games has been on the increase in recent years.