______ a good result，the professor decided to do the experiment once more．

In the beginning，the man refused to say anything about the lost car，but he had to admit ________ it because of the solid proofs.

______ the project in time, the staff are working at weekends.

He kept putting his dream to the test –even though it meant ____________ with uncertainty and fear of failure.

____ the days he had spent with his American friends, he couldn’t help_____.