The radiation amount of a mobile phone for two half-hour periods per day is equal to ___ to an X-ray for ten seconds.
People never ask for ______second bowl of soup at a dinner party in western countries.
_____ is mentioned above, the number of the students in the senior schools is increasing. A which B As C That D It
How are you going to _______ such problems?
Some pre-school children go to a day care center, ______ they learn simple games and songs.
The boys were playing football on the ground. Sam didn’t want to _______ them.