(2013·山东卷)There is no simple answer，________is often the case in science.

The taxi had to because the traffic light turned red.

Would you like some coffee—Yes, and please get me some milk, too. Iprefer coffee ____milk.

Thisis my treat and next is yours. How is that—OK._______.

Mr King came back to our village—Really For what—The old man________ the noise in the city