So many uses have been discovered for this wood __________ the supply of white pine is becoming smaller and smaller.
| A．then | B．what |
| C．that | D．which |
China sent up two manned spaceships and they were also great scientific _______ in the world.
| A．campaigns | B．surprises | C．achievements | D．discoveries |
She is one of the few girls who _____ in the kindergarten.
| A．is well paid | B．are well paid | C．is paying well | D．are paying well |
Every means _____ prevent the water from _____.
| A．are used to; polluting | B．will be used to; polluting |
| C．is used to; polluted | D．is used to; being polluted |
Not only I but also Jane and Mary ____ tired of having one examination after another.
| A．is | B．are | C．am | D．be |
Nobody but us _____ the secret.
| A．know | B．knows | C．have known | D．is known |