OK, here goes... 1) "The Chang children helped out their parents by making sandwiches for the whole family." You have a plural (children) so C and D are impossible. "Helps" means a single person. "Help out" is a phrasal verb, and the collocation is "help out (someone)". "Help with" is not a phrasal verb. The collocation is "help with (verb+ing)", ie. an activity. "The children helped with making sandwiches." 2) When will classes resume? Several weeks from now. In the sentence, the storm has already finished. The classes are cancelled because of the damage. "Later today" and "tomorrow" are too soon to qualify as "further notice". 3) "Because it is considered impolite, do not pour your own drink when eating in a restaurant in Japan." There's a clear difference between "should not" and "do not", so C (like B and D) is not possible. "Because" can begin a sentence, but the clause cannot be the whole sentence - you need a two-part sentence.

1. A 2.Actually the answer here is unclear, as classes have been cancelled untill further notice (in other words we do not know when they will resume). So that rules out A. B. The best answer is probably C, but it is not a good question. 3.It's a choice between A and C. There is nothing wrong with starting a sentence with because. Because the world is round, it turns me on! :-)

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and for the last question, I decided that the answer is C. I learnt that any statement can not begining with because. Because of that I discarded the option A. But surprasingly that is the answer. I do not know why.

We heard on the radio that because of damage to the school caused by the storm, classes are cancelled until further notice. When will classes resume? A. later today B. tomorrow C. several weeks from now D. when the storm is over I am really lost in this question. I think the answer is D because I found it logical. But if you pay attention to "further notice", it does not mark any specific time. the answer is C but I can not figure out which is the difference between C and D For me both are same.