begin|began|begins|begun

单词 'cat' 以字母 'c' 开头。

The word 'cat' ___begins with the letter 'c'.

让我们从最简单的任务开始。

Let's ___begin with the easiest task.

他们已经开始建新桥了吗？

Have they ___begun building the new bridge yet?

我想课程是昨天开始的。

I think the class ___began yesterday.

孩子们开始哭了。

The children ___began to cry.

会议已经开始十分钟了，你迟到了。

The meeting had ___begun ten minutes before you arrived late.

孩子们已经开始学游泳了。

The children have ___begun learning how to swim.