I hear Sam has gone to Qingdao for a holiday.—Oh, how nice! Do you know when he________?

According to the weather report, there is likely to be heavy rain tomorrow.—_______, we’ll have to change the plan for the outgoing.

Could you please come to the museum with me this afternoon?—Sorry，I ________．I have to take a piano lesson at 2 pm．

I’ll not be Jack’s friend any more.—Don’t be angry. He’s just so , but in fact he’s good to us, you know.

Nobody knows ______ yesterday.