So far the majority of cloned animals have suffered from some different serious disorders, ______ died soon after birth.
| A．many of which | B．many of whom | C．many of them | D．many of that |
We asked Tom and Mike, but ________ could offer any help．
| A．both | B．all | C．none | D．neither |
Being a parent is not always easy, and being a parent of a child with special needs often carries with _______ extra stress.
| A． it | B． them | C．one | D． him |
She felt very nervous as so many eyes were ____________ her.
| A．fixed at | B．looked on | C．focused on | D．watched |
____ ，but he still could not understand it.
| A．Told many times | B．Having been told many times |
| C．He had been told many times | D．Though he had been told many times |
Never keep ________with dishonest persons.
| A．company | B．track | C．touch | D．pace |