____twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

Mr．Smith was very glad _____ as the manager of  the company．

Moreover,27.6 percent of  those ____preferred reading on their mobile phones, which was 4.6 percent higher than last year.

Cell phones are now widely used,  _______possible for us to talk to anyone from almost anywhere.

________ that I was a regular visitor, the servant let me in.