When seeing the snake, she       a scream.

 The good thing about children is that they ___________ very easily to new environment.

Until recently historians assumed that calendars ________ with the advent of agriculture.

---Mary was asked to do something important.---It doesn’t matter. Let’s        the work where it is left off.

(2014·福建名校质量检查)The tanker，which was full of petrol，________and gave off heavy and dark flames the moment a truck knocked into it.