I have been to Wuxi.

It has been a while.

In chemistry class, I learned about the reactions of acid anhydrides.

He was left in a state of statelessness.

In our club, we conducted a secret ballot to choose a new leader.

The trolleybus is very convenient as a means of urban transportation.

He was diagnosed with asplenia.

This country has fallen into anarchy.

He accidentally held her hand.

He attacked the enemy's position using a recoilless rifle.