8. Usually passengers are required toarrive at _____ one hour before ______ takes off.

We should read such books ____ will make usbetter and wiser.

I think students should have mobile phones to call their parents.- _____. They often use them to play games instead.

Your desk is crowded with too many unnecessary things, including used papers and books.You’d better ________ some of them.[ ]

int is not who said the words, _____they are true or not.