______(on;at;in;for)the school uniform

______(on;at;in;for)the school uniform The principal dwelled ______ traffic safety in his talka、on b、 in c、 at d、 for Mike is better than Peter ______ swimming.选项:a、for b、at c、on d、in This new penci-case is only ______(A.in B.on C.for D.at) Jimmy What do you do ______ your free time?A.at B.in C.on D.for After school ,I play football ______ an hour.A.at B.in C.for D.on ______（in,on,at）summer holiday .____ entering the hall,he found everyone waiting ______ him.A.In…for B.On…for C.On…at D.In…at in on for at的用法?^^ at,on,in,for各怎么用? inatforon各加什么? at on in for of的区别 on用法（in,at,for） _____different seasons(in on at for) in,on at,about,to fromHow ______ spring in Shanghai? 32.You’ve passed the exam.I’m happy ______ you.A.on B.at C.in D.for 31.You've passed the exam. I'm happy ______ you. A. on B. at C. in D. for Susan plays tennis very well.She is ______ her schoolm tennis team.A.in B.at C.for D.on