______ Barbara Jones offers to her fans is honesty and happiness．
| A．Which | B．Whom | C．That | D．What |
It is high time we ______ awareness of environmental protection.
| A．promoted | B．would promote | C．shall promote | D．had promoted |
How can they learn anything useful ______ they spend all their spare time playing online games?
| A．while | B．unless | C．although | D．when |
______ is it that metals plays such an important part in our daily life?
| A．Why | B．What | C．Where | D．When |
He is strict and kind-hearted teacher, ______ the children respect but are a bit afraid of.
| A．which | B．that | C．one which | D．one whom |
They have the right to check ______ the 
will is valid(有效的), of course.
| A．whether | B．why | C．when | D．how |