In the third photo，he is________in the pool．
A．swims
B．swim
C．swimming
D．swiming
Jack________doing________homework．
A．is，her
B．is，my
C．isn’t，his
D．isn’t，my
Nancy with her friends________now．
A．play
B．plays
C．is playing
D．are playing
Listen！Who________behind the tree？
A．sings
B．sing
C．singing
D．is singing
My brother left school in 2005，and since then he________in Beijing．
A．lives
B．lived
C．will live
D．has lived
We didn’t start our discussion________everybody arrived．
A．since
B．if
C．while
D．until
