_________several times, but Mary still has no idea of how to do it properly.
------ The authors of computer viruses are geniuses. ------ I agree. They can apply their wisdom to other net technology ________ human beings can benefit.
I’m lucky _______ the thing I enjoy doing more is ________ I’ve ended up doing.
The construction of the two new railway lines ________ by now.
These teenagers don’t know much of the world yet; that’s why they are so easily _________ .
Everyone Obama meets seems to be _________ with his pat-on-the-back signature.