There is no doubt _____ China has made rapid progress in space exploration.
catch the first bus, he got up very early this morning.
--Look! The telephone is broken. Someone damaged it ________ purpose. --That may be right. But perhaps it was broken _________ accident.
It was because of bad weather __________ the football match had to be put off.
It is the first time that I _______ this kind of moon cake.
I don’t think that the necklace is made of diamond, ________?