曲线的渐近线条数()

heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.

It'smore________tobuyaseasonticketifyoutraveleveryday.

1949年中华人民共和国的建立，标志着中国从半殖民地半封建社会进入_________。

“Haveyoumovedintothenewflat?”“Notyet.Therooms________(paint).”