Where’s Jack—He has left a saying that he will be back in a minute.

(2014·日照模拟)The young man was modest and worked hard，and gradually managed to________his status

I enjoywhen you help whoever is suffering in the earthquake.

I don’t like math _______it’s difficult for me.

It is politely requested by the hotel management that radios __________ after 11 o’clock at night.[ ]