After supper,he kept on _____ (play) computer ganes.Be careful ______ (not walk) on the ice.

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After supper,he kept on _____ (play) computer ganes.Be careful ______ (not walk) on the ice.
After supper,he kept on _____ (play) computer ganes.
Be careful ______ (not walk) on the ice.

After supper,he kept on _____ (play) computer ganes.Be careful ______ (not walk) on the ice.
playing
not to walk

on是介词,后面要加doing形式
be careful to do小心做某事,否定直接在to前加not