There’s no way of knowing why one man makes an important discovery ___ another man, also intelligent, fails.

 It’s reported that many wars broke out in the Middle East. What’s your ________ of the situation there?

I haven’t been home to see my parents for two weeks; I _______ them.

I am ________ about what I say because careless remarks are likely to hurt others’ feelings

We have time and again ______ our position on Taiwan issue!Whatever happens，we won’t change it!