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.