.I _____ to telephone you last night, but the line was out of order and I couldn’t get through.
The computer system _______suddenly while he was searching for information on the Internet.
Whatfun it is to walk alone withfull moon hanging in the sky.
I insisted __________ to see a doctor, but he insisted nothing __________ wrong with him.
He studied hard, __________ the exam.
What makes us worried is that the number of people ______to drug is ________.