Natural disasters occur at ________ times, so it is always difficult to warn people in advance.
| A．random | B．exact | C．flexible | D．absolute |
The main street is lined with small stands and shops _____ sell almost anything you can imagine.
| A． what | B． where | C． who | D． which |
To my great disappointment, my best friend left the city I could have a word with her.
| A．before | B．after | C．while | D．until |
The stadium is very splendid and attractive in appearance, may be imagined.
| A．it | B．what | C．as | D．that |
I wondered why John kept it a secret. It was not until he three times that he told me the truth.
| A．asked | B．was asking |
| C．had asked | D．had been asked |
the duty of taking good care of my parents, I have decided to work in Quanzhou, which is close to my hometown.
| A．To consider | B．Considering |
| C．Considered | D．To have considered |