ton|tons

就在这时，我看到一辆二十吨的卡车朝他们疾驰而去。

It was at this point I saw a twenty ___ton lorry speeding towards them.

一头小象的体重可达5吨。

A small elephant can weigh up to 5 ___tons.

这家工厂每天产生约10吨废物。

The factory produces about 10 ___tons of waste each day.