用适当的介词(under,for,in,with,at,on)填空。(18分) (1)What can I do ______ you? (2)Can you go shopping ______ me? (3)Ann is good ______ painting. (4)I usually visit my grandpa ______ Sundays. (5)There's a ball ______ the chair. (6)My father watches TV ______ the evening.