I was cooking in the kitchen when Dora returned, her face _________with mud and sweat.
With so much noise of the traffic, I couldn’t ____ and do my research work.
Zhang Yinying has trained continuously for six hours. ______ that she is tired out.
I wonder ______ that my children have picked up such words.
Now then, children, it’s right time you ______.
______, some people think there is something in them.