1- after preposition we need either noun or -ing so the answer is D
2- In is a connector, we will have 2 full structures, the first one is find, in the second one we will need a verb and because we have (who) which is an adjective clause so we will need after the verb to a noun. the right answer is C
3- we have a part of the verb (chosen) and adverb and objective ... we need a subject and the verb to be to complete the structure. this time the answer is B
4- we need subject and verb, there (subject: noun clause connector) and were is the verb... the answer is C
5- we have more [\/B]in the structure so we are looking for than .... then it is A
6- it is a one structure... the first part include sub+ verb+ preposition(obj) , we have the word observation so after that wee need either another preposition or an adjective for the word observation .... the trick here that we think the choice that the heavenly bodies go ) is incorrect because of existing of the word heavenly, but in fact heavenly is an adjective not an adverb,,,, so the right answer is D
7- we have to full structures so we need a connector, the right answer is Because choice A
8- it is in the passive form (simple present) so we are looking for be_verb + p.p ....we have (is used) choice number A
9- the main verb of the structure is (moved) so (were opposed) is a part of an adjective, we need to complete the subject and because we have the subject is referenced to people, we need who /that for the adjective clause, we have (settlers who) is the right answer D
10- we have in the structure (that: to explain more... the right answer is so which is A... ( so... that...)