―How come I didn’t get the message that we were to have the meeting at 4 pm? ―Well, your phone ________ 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.