Can I have your name, sir–Err… Albert Johnson, if you _______ know.

Hey! Everyone in the office was at thedinner party in honor of Mr. Charles except you. What happened— I ______ after Mike, my colleague. He wasbadly ill.

The group of students went to the suburb, did some research work, and ________ the water in the river to see if it had been polluted.[ ]

Maybe you have been to many countries，but nowhere else　　　 such a beautiful palace.

On July 4,2009,a sixty year old man in Missouri managed to climb out of the car in the accident, unhurt [ ]