There are many flights to Dalian, and the city has connections with most large cities in China, but you need to make a(an) ________ in advance.
If you don’t go there, ______.
She is already 18 years old, but she _____ as if she were still a little girl.
The time has come ______ we can make extensive use of nuclear energy.
Your performance in the driving test didn't reach the required standard—____, you failed.
—What will you do next Sunday? —Maybe do some shopping, for I ______go to school on Sunday.