Question

1.I saw Li Lei —— on the playground just now(play)

Answer 1

1.I saw Li Lei playing on the playground just now.

我刚才看见李磊操场上玩.

刚才看到他正在玩,

see sb.doing看见某人正在做某事

所以填Playing

2.I‘II go to the airport to see her off(改为同义句)

I‘II say goodbye to her at the airport.

我会去机场为她送行.

送行 see sb.off=say goodbye to sb.