Что надо вставить? you really be sitting here. a.) couldn't b.) shouldn't you be older than me, but that doesn't mean you're cleverer. a.) could b.) may i'm afraid that nobody help me in that kind of situation. a) should b) would

You really be sitting here. b.) shouldn't
You be older than me, but that doesn't mean you're cleverer. b.) may
I'm afraid that nobody ... help me in that kind of situation. b) would

You shouldn't really be sitting here.
You may be older than me, but that doesn't mean you're cleverer.
I'm afraid that nobody would help me in that kind of situation.