In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ________ we have never experienced before, ________ makes us worried a lot about nature disasters.

Mr Li, I can’t understand everything in class.— Don’t worry! I’ll ______ the main points at the end.

Many of us love traveling, but lack of financial _________ often holds us back from seeing the world.

We don’t know _________. She is new here.

It was ____ exciting news that more than ten students in a single school were admitted to Tsinghua University in the same year.