I tried phoning her office,but I couldn’t ________.

New digital mobile phones definitely produce less radiation, but that doesn’t mean that they should be used without caution.

Why did your parents buy a shiny golden silk dress yesterday—They bought it _____ me. It’s my birthday today!

The world’s elderly population will exceedthat of children by 2060, when each group ________ to account for about one fifth of the population.[ ]

Will it rain tomorrow– No I don’t doubt ________