_______have you been learning to swim?—Half a year. [ ]

Spring is a good season _____ hiking. [ ]

The children took a trip the Great Wall last week. [ ]

Did you see “Gossip Girl” last night? —Yes. Leo fell _______ love _______ Gina while she was mad _______ him. Isn’t that amazing! [ ]

Sam, come downstairs, please. I need your help.—Sorry，mum. I on the phone..