Many strange new means of transport have been developed in our century, the strangest of _______ being perhaps the hovercraft(气垫船).

After the Arab States won independence, great emphasis was laid on expanding education, with girls as well as boys _____ to go to school.

 With all the money ________, the man had to make a living by begging.

Five years later, he returned home, his character greatly _________.

With a lot of difficult problems _________, the manager felt worried all the time.