If you want to know the meaning of the word______, you’d better look it up in the dictionary.

________ thirty minutes earlier, you would have seen the beautiful rosy dawn.

There are _____ workers in that factory. And about ____ them are from China.

Was his father very strict with him when he was at school？—Yes, he had never praised him _______ he became one of the top students in his grade.

When was it________you let out the secret?