Q1. As the sentence contains an interrogative '언제', you should change '것을' for '지를'. (To be exact, unlike '것' or 'when', '지' is not a pronoun. So you have to write 올 and 지 with no space, and Using '를' is just optional. But even Korean people are often confused about spacing '지', you just ignore it...) Additionally, '지' is used when you are not sure of something. So, in addition to using it with an interrogative, you can say 'I don't know if she comes or not' like '그녀가 올지 말지 몰라요' Q2. Although '주시다' is the right honorific form of '주다', but only when it is used to honor the subject. So you can use '주셨어요' only in the situation where 'the grandfather' gave you a present. When it means I gave 'my grandfather' a present, the right answer is '드렸어요'(the original word is 드리다), which is the completely different word that is only used to honor the object. Q3. If there is not any other context, b) is the answer because '지루해요' is the present tense. c) can't be the answer, because it means the tasks you are already done with and won't any more, so it can't make you bored now. d) is future tense, so it can't be the answer. But actually a), it sounds similar to c) though, can be the answer with other sentences. e.g. 'Now I feel bored with the same tasks I've done everyday, so from now on, I want to do other things'. I think it's because a) means the tasks you've done everyday, but it does not tell anything about the future