10. I've been so busy that I haven't
slept ... two days!
a) for
b) since
11. We're ready to leave. In fact, we've
been ready ... an hour.
a) for
b) since
12. Sam and Martha have owned their
new car ... April.
a) for
b) since
13. I haven't watched TV ... the day
before yesterday.
a) for
b) since
14. Isabella hasn't ridden her bicycle
... she fell off it last week.
a) for
b) since
15. I'm really hungry! I haven't eaten
... this morning.
a) for
b) since
16. Iceland has been inhabited ... only
about a thousand years.
a) for
b) since
17. My neighbors have been away on
holiday ... several weeks.
a) for
b) since
18. Our universe has existed ... billions
of years.
a) for
b) since
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Respuesta:
10. for
11. since
12. since
13. since
14. since
15. since
16. for
17. for
18. for
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