15. _____ U2, the Irish rock band from Dublin perform a concert in Beijing, tell me in advance.
____ Knowledge of English is a must in international trade.
Cloning the sheep ----Dolly is a big ____ in science.
----Who did you spend last weekend with? ---- _________________ .
She is not worth _ .
---Shall we go swimming? ---Ok, I’ll just go and get __ .