What theywhenyou got there, Tom–Sorry, I forget.

The split between humans and apes is believed byscientists______15 to 20 million years ago

27．—Mary, you didn’t show up at the meeting last week? —No, I________, but my son had a sudden fever and I had to stay at home to take care of him

is he?–He is PSY. He sang the song Gangnam Style (《江南Style》).

I don’t think he will pass the exam, ________?[ ]