网址：http://m.1010jiajiao.com/timu_id_796716[举报]
Amy is good at ______.
A.swim B.swims C.swimming D.to swim
Tina is _____ at the pool．It's dangerous．
A．swiming B．swimming C．swim D．swims
My uncle is good at ________．
A．swimming
B．swiming
C．swim
D．swims
Liu Ying is good at______.
A. swim B. to swim C. swimming D. swims