This area experienced.____ heaviest rainfall in _____month of May.
A. 不填; A. B. a; the C. the; the D. the; a
Legend has ______ that CaoCao, King of Wei kingdom in the Three Kingdoms period, built 72 tombs to confuse tomb diggers.
| A．it | B．this | C．them | D．itself |
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 |