Itwasasmallplacethencomparedto_______itisnow.
A
what it is 是介词 to 的宾语从句，相当于一个名词。 compared to what it is now ：与它现在的样子相比。
______ofasentencedependsonthecontextinwhichthesentenceisuttered.
A linguistic theory is constructed about what ______ is and how it works.
The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.