It is necessary to give ___of their spare time to their stud

It is necessary to give ___of their spare time to their stud His parents used to play Majiang in their spare time,----- - necessary time it to read give is children to连词成句 Here are some exercise books.Please give（）（their）to the stud his spare time is made full use( )law.(of studing/of to stud Teach you how to in their spare time to make money和how to ma give their children a bit time to themselves she is willing to devote as many spare time as is necessary这 Some pupils fill their spare time ____ computer games.It is 1.Do you think it is necessary for a college student to stud It is their time to visit the Summer Palace中to visit在句中做什么? His parents used to play Maijiang in their spare time,_____?