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

Where did you meet your wife for the first time —It was on the farm ______ she used to work.

You have made a few mistakes in spellingBut ______ you’ve done a good job

came all the way to inform you of the time and place of the meeting.－You could have __________ yourself the trouble by calling me.

It is because of its geographical position that typhoon isin Taiwan during summer.