Mr. Green is said _____ an experiment to prove the new method of solving the problem when young.
| A．to do | B．to have done | C．to be doing | D．to have been doing |
There are two main sets of Games — the Winter and the Summer Olympics, and both are held every four years on a _________ basis.
| A．valuable | B．former | C．regular | D．swift |
The __________ to the rocket going into space went wrong, and as a result it exploded and fell into the sea.
| A．mark | B．sign | C．symbol | D．signal |
Put the cleaned fish in a mixture of 300g of salt and one liter of water to ________ all of the blood from the fish meat.
| A．replace | B．remove | C．calculate | D．spoil |
We give dogs time, space and love we can spare, and ____________, dogs give us their all.
| A．in charge | B．in fact | C．in case | D．in return |
Barbara has worked here for three years, so I’m sure she’s quite ______ to the task.
| A．equal | B．fair | C．worth | D．informal |