has gone to Beijing, but I’m wondering why he ________ in such a hurry.

In the new curriculum, some courses are, while others are optional for middle school students.

Only when they were told the date of the wedding ________ their daughter would get married. [ ]

seems to be a strong competition for students to enter a key university.

What a beautiful bike! Whose is it —It’s mine. I ______ it for two days.