I’ll never forget the most wonderful holiday ________ we stayed in the country with my grandparents.
A．when B．which
C．where D．that
At 13，Samuel received a training course in drawing for three years，________ he got a good opportunity for further development.
A．after that B．after which
C．after it D．after this
Her sister has become a lawyer，________ she wanted to be.
A．who B．that
C．what D．which
Let’s talk about the persons and the things ________ we can remember.
A．which B．whom
C．that D．what
So far all cloned animals have suffered from some different serious disorders，________ dying soon after birth.
A．many of which B．many of whom
C．many of them D．many of that
The students ________ are expected to pass.
A．were taught by Professor Deacon
B．whom were taught by Professor Deacon
C．when were taught by Professor Deacon
D．Professor Deacon taught
