The conclusion from the study is not definite; it is just ________.

It is not decided ________ the conference will be held.

Johnson was ________ unknown before running for the presidency.

Children have a natural ________ about the world around them.

―________ fine day it is today!

The volunteers would rather go by train than ________.

There is a growing body of evidence to support the fact that most people suffer from a lack of daydreaming _______ an excess of it.

The engineer ______ my father works is about 50 years old.

The other timing system belongs in our internal clocks，which，left ________，would tie the body to a 25-hour rhythm.

_______ for the free ticket, I would not have gone to see film so often.