Nowadays, most young people enjoy ______ on the Internet.
Sorry, we are late,--our plane was _____ because of the heavy rain.
I’d like to have visited the Palace Museum, but something unexpected _______ to my father.
-What are you busy with ? -The conference _______ in our city next week.
Attention, coffee lovers! We have for you, the best coffee machine _____ invented.
Can you imagine what difficulty people had this year _______________against thesevere naturaldisasters?