Verb Tenses

George hurt his head while he _______ .

He  ________  five letters to the manager by the time he finally received an answer.

Up to now, I ______ any opportunity to check this information.

Say goodbye to Ann now. By the time you return, she  _____ for New York.

Please don't ring the doorbell when you get here. My baby ______ .

 Thomas is an author. He (write) _____ mystery novels and travel memoirs. He (write) _____ since he was twenty-eight. Altogether, he (write)_____seven novels, three collections of short stories and a book of poetry.

The students (be, usually) _____ taught by Mrs. Monty. However, this week they (teach) _____ taught by Mr. Tanzer.

Max __________ for the CIA since 1992.

The last time I __________ to Korea, I spent three weeks on Cheju island.