Thanks to modern ____________ (航空,飞行), we can now move through space at an inhuman speed.
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Thecompanymaybereluctanttodeviatetoofarfromthebasictermsofthisagreement,butthereareanumberofthingswhichare_________________(可协商的,可讨论的).
Most travel is __________ (确实无疑地,显然;坚决地,果断地) optional.
Withthepopulationofthisfascinatingandlovablepandaclosetoextinction,anyeffortto_____________(使稳定,稳固)thespeciesmustbeworthwhile.
Hewouldneverunderstandhowshecould_______________(记忆,记住)allthosecomplex,impossiblylongpoems,yetforgetthewordsofasimplesongshemusthaveheardathousandtimesormore.