The sign reads, “In case of ________ fire, break ________ glass and push ________ red button
| A．/;a;a | B．/;the;the | C．the;the;the | D．a;a;a |
He knew the problem was serious and undertook to look into it he reached the office.
| A．suddenly | B．immediately | C．abruptly | D．shortly |
To my delight, the snakes, carefully, turned out to be no trouble and all went well according to the plan.
| A．monitoring | B．being monitored | C．having monitored | D．monitored |
Catch the star that holds your fate , ______that forever twinkles within your heart.
| A．one | B．the one | C．it | D．that |
We have been excavating layers of ash almost six metres thick, which suggests that they the fire burning all winter.
| A．should keep | B．might have kept | C．should have kept | D．might keep |
Only in 1996 the determination and patience of the scientistswith a breakthrough at last .
| A．were ; paid off | B．did; pay back | C．did ; pay off | D．did ; pay for |