However, they dont envision obtaining soil samples from Mars until_____to try to ascertain

They can vote in ______ district they choose.A．whicheverB．wheneverC．whereverD．however

Advances in science and technology helped solving many problems. However, they have also c

While Ashopping, people sometimes cant help Bpersuading into Cbuying something they dont r

________（47）A.However they just don’t have as muc

________（48）A.However they just don’t have as muc

________（49）A.However they just don’t have as muc