15. _____ U2, the Irish rock band from Dublin perform a concert in Beijing, tell me in advance.
This pop star is very ______ with young people, who like his songs and style.
Susan advised me not to buy the vase, but I bought it _____.
Scientists in some countries have done a lot of work to _____ the moon.
She does not know _____ the situation, for she is too inexperienced.
I know these flowers are not natural, but the _____ ones look more beautiful and can last long.