Some person ____   calling for you at the gate.

The number of the people who speak English         large, and a large number of people         native speakers.

The first use of atomic weapons was in 1945, and their power ____increased enormously ever since.

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

Not only the USA and Russia but also China ________ manned satellites to circle the earth.