Tea _______ by accident about 5000 years ago.
invented
was invented
is invented
---Would you mind ______ the door? It’s cold outside. --- OK. I’ll do it right now.
---Is doing morning a good habit? ----Yes, it is.
It’s my ___________ time to go to Beijing. I never went there before.
I get _____ flu. I should see a doctor at once.
There was a big earthquake in Japan, but luckily many people _______.