He seems to have __________ (忽视，忽略) one important fact.

I believe the house was __________ (故意地) set fire to, not accidentally.

Please come here whenever it is ___________ (方便的) to you.

The students wanted their teacher to compare the _______ (文明) of ancient China with those of ancient Rome.

I became even more ________ (困惑) about all the different labels on the goods after the explanation.

We are sad to know that many people lost lost their lives and so many buildings were _______ (毁坏) in the Yushu earthquake.