有只蚂蚁在你腿上爬。

There's an ant ___crawling up your leg.

数十只大红蚂蚁正爬到她身上。

Tens of big red ants are ___crawling onto her.

仔细观察后，我们注意到一队小昆虫正沿着窗台爬行。

Upon closer inspection, we noticed a line of tiny insects ___crawling along the window sill.