grammatical problem，need help！！
我想请教各位前辈一些语法。[color=#31365f][font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px]1） He was the leader [color=#0000ff]on[/color] which/who we relied . He was the leader which/who we relied [color=#ff0000]on.[/color][/size][/font][/color]
[font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px][color=#ff0000]
[/color][/size][/font]
[font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px][color=#000000]以上有语法上的错误吗？
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[color=#31365f]2）The game we are enjoying.[/color]
[color=#31365f] Material we can use.[/color][/size][/font]
[color=#000][font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px]以上有语法上的错误吗？[/size][/font][/color][font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px][color=#31365f]
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[color=#31365f]3) Fetch me that pen [/color][color=#ff0000]that[/color][color=#ff0000] [/color][color=#31365f]belongs to Ali.[/color]
[color=#31365f]Fetch me that pen [/color][color=#ff0000]Which[/color][color=#31365f] [/color][color=#31365f]belongs to Al[/color]
that 和which 可以互换使用吗？[/size][/font][font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px]
[/size][/font]
[font=Arial, Verdana, Helvetica, sans-serif, Simsun][size=16px][color=#31365f]4)[color=#454545][font=Arial, Verdana][size=12px]X is the numeric value [/size][/font][/color][font=Arial, Verdana][size=12px][color=#ff0000]at[/color][/size][/font][color=#454545][font=Arial, Verdana][size=12px] which to evaluate the distribution.[/size][/font][/color]
[font=Arial, Verdana][color=#454545][size=12px]如果我把at 去掉，可以吗？[/size][/color][/font]
[/color][/size][/font] 第一个我感觉要提前的。
第二个没错误
第三个用which
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