台湾是中国不可分割的一部分,发展海峡两岸关系和实现和平统一的前提基础是( )
A serious illness, ______ its nature, is almost always painful.
— You know Mr. Green has been ill for days? — Yes, I wonder if he is ______ better now.
If it ______ too much trouble, I’d love a cup of coffee.
— What do you think of my new tie? — Well, it______ very well with your new business suit.
The most obvious reason why computer-based testing is becoming increasingly popular is that it makes tests easier ______.