Chọn từ đúng: Efforts should be made/ can be made to offer all child equal access to education

chọn từ đúng
1/ efforts should be made /can be made to offer all child equal access to education
2/ sunrise might be observed/can be obversed in the early morning.
3/ important work will be done/ can be done first
4/ milk should be kept / must be .... in the fridge or it will go sour
6/ the afternoon meeting must be postponed /might be because 3 of 5 commitee memmbers are unable to tend
5/ our teacher told us that allof asignment must be written / should be......in ink