【C3】A．performedB．behavedC．workedD．studied

【C20】A．study wellB．studying wellC．study goodD．studying good

A．performedB．studiedC．broughtD．taken

【C11】A．movedB．settledC．workedD．migrated

This maths problem is easy ______________.A.work outB.to be working outC.workedD.to wor

【C3】A．puzzlesB．mysteriesC．marvelsD．studies

[A] studying [B] studied [C] to study [D] having studied