The split between humans and living apes isthought by some scholars ____ 15 to 20 million years ago.

The weather in Heilongjiang is much colder than _______ in Hainan.

xa0;important role in a new movie, Andy has a chance to become famous.

Tommy had his big brother _____ his shoesfor him

So convenient ______ to pay by credit card that more and more people apply for their credit cards. [ ]