Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.

— Why does the lake smell terrible?— Because large quantities of water ____.

E-mail, as well as telephones, _______an important part in our daily communication.      

(2013·咸阳一模)When we entered, we found lying on the ground ________ along with her parents.

---You could have walked here.---Yes. A taxi ___________ necessary.