It is not decided ________ the conference will be held.
A、whatC
A什么B哪一个C什么时候D(无词义)
The conclusion from the study is not definite; it is just ________.
The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.
The engineer ______ my father works is about 50 years old.
This is an important problem _______ too few social scientists have researched.
We refer to the limited range of sounds as the phonic medium of language and individual sounds within that range as ______.
