1、 I must apologize ________ not answering your letter in ti

1、 I must apologize ________ not answering your letter in time.
A from B with C for D in
2 、She tried to make up ________ the lost time ________ staying up late.
A for;by B with;by C for;with D with;with
3、 We should prevent people ________ shooting _______ birds.
A from; at B of ; to C against; at D from; to
4 、You may paraphrase this sentence ________ your own words.
A by use B use C within D in
5 、An idea occurred to me ________ I might turn to my English teacher for help.
A which B that C where D when
6 、Words came from Mr Smith ________ he could arrive on the following Saturday.
A about which B that C whether D of which