—I left my handbag on the train, but luckily someone gave it to a railway official.—How unbelievable to get it back! I mean, someone________ it.
You can see the stars on a clear night,but in the daytime they are _______.
Since Tom ______ downloaded a virus into his computer, he can not open the file now.
He began to take political science ____ only when he left school.
She devoted herself ______ to her research and it earned her a good reputation in her field.
The committee is discussing the problem right now. It will_____ have been solved by the end of next week.