Right after the boy got out of his house, it started to rain heavily.

A. has been written/has not

B. has written/has not finishing

C. is writing/has not been finishing

D. has been writing/has not finished

A. out of/down

B. through/back

C. back on/up

D. down on/out

A. difficulties in using language

B. being unable to make friends

C. being away from all that is familiar

D. feeling desperately homesick

A. demerits

B. hazards

C. disadvantages

D. dangers

A. He grew older and more and more forgetful.

B. He became more forgetful and older.

C. As he grew older, he became more and more forgetful.

D. He grew older when he became more forgetful.

A. In 1899, National Geographic became one of the most influential magazines in the world.

B. National Geographic is one of the most influential magazines coming into being in 1899.

C. National Geographic, one of the most influential magazines in the world, came into being in 1899.

D. National Geographic came into being as one of the most influential magazines in the world in 1899.