――How many children are there in your family ?――So many there used to be, but now I am_______ an only child.
She likes doing her homework _______ the radio _______.
In winter, we must pay attention to _________.
He thinks watching movies ________.
When we practice speaking English, we often end up _______ in Chinese.
There is ______ “u” and ______ “s” in the word “bus”.