she took the old man to____(safe).按适当形式填空.
that man()be her son.he left for shanghai this morning.
A.can't B.mustn't C.needn't D.aren't
the Chinese population is over1.3billion.
yes,si each pair of parents in many places()only()one child.
A.can,has B.can,have C.can't,has D.can't,have