While they were playing, a bomb _____ on the Bay Bridge, and one boy was injured seriously.
| A．explored |
| B．fought |
| C．exploded |
| D．happened |
-----Did your father come back early last night?
-----Yes ,It was not yet eight o’clock _____he arrived home.
| A．before | B．when | C．that | D．until |
To keep safe _______an earthquake, you should remain at a spot in your room where nothing may fall on you.
| A．in search of | B．in advance of | C．in terms of | D．in case of |
—He is eager to try something he has never tried before.
—Oh, I see. That’s _______ he’s different from others.
| A．when | B．where | C．how | D．what |
–Do remember to charge the battery 12 hours when you first use it.
--_________.
| A．Made it | B．Got it | C．Understood it | D．Remembered it |
My English teacher insisted that the exercises _________ very difficult and that we ________ it carefully.
| A．were; must finish | B．be; finish | C．were; finish | D．be; finished |