下列计算正确的有（　　）

①（-4m²a）³=-64m⁶a³；②（2m²x³）²=4m²x⁶；③a^m-n=a^m-aⁿ；④6aⁿ⁺²÷3a^n-1=2a；⑤（-a³）²=-a⁶

A．1个

B．2个

C．3个

D．4个

词汇（10分）

小题1:I hope you and your classmates will enjoy ________(you) during your trip.

小题2:Not everyone is as ___________(humour) as Mike.

小题3:-----Are you better today?-----No, I am even _______(ill) now.

小题4:Li Fang is the _________(shy) of all the girls in her class.

小题5:Let’s go and ________(cheerful) for your school volleyball team.

小题6:After a long time and much effort, the climbers ____________(final) reached the top.

小题7:Look! Those_________(swim) are trying to swim across the lake.

小题8:For Linda, __________(keep) fit is not easy because she is very lazy.

小题9:Jim is always willing_______(help) his classmates with their problems

小题10:________ (luck), the climbers helped him to come down from the hill.