Solution:
You use 'although' to introduce a subordinate clause which contains a statement which makes the main clause of the sentence seem surprising or unexpected. Example: Although I was only six, I can remember seeing it on TV. Although he was twice as old as us, he became the life and soul of the company.

Solution:
'May' is a modal verb most commonly used to express possibility. It can also be used to give or request permission, although this usage is becoming less common.

Solution:
'carries' is correct because the sentence is in present tense and 'she' is a singular pronoun.

Solution:
Sentence is in present perfect continuous tense with active voice. Rule : Subject + have/has + been + V-ing + other agents. Shraddha has been working since afternoon.

Solution:
'out of' means indicating the source or derivation of something; from.

Solution:
'A lot of' and 'lots of' can both be used with plural countable nouns and with singular uncountable nouns for affirmatives, negatives, and questions.

Solution:
Present perfect continuous tense is used when a work is being continued for some time from the past. has been flying is the most suitable option.