She is _____ newcomer to _____chemistry but she has already made some important discoveries.
A．the; the B．the; / C．a; / D．a; the
–Tom, what’s the matter with you? You look so worn out!
--Nothing serious. I ____ my new house all the day and I am afraid I won’t finish until tomorrow afternoon.
A．have whitewashed B．am whitewashing
C．have been whitewashing D．shall be whitewashing
Confronted with the complex international situation, we need a foreign policy that is more ____.
A．symbolic B．confidential C．controversial D．flexible
The incomes of skilled workers went up. ____, unskilled workers saw their earnings fall.
A．Meanwhile B．Moreover C．Therefore D．Otherwise
–Mom, I will send you a gift for your birthday, ____ beyond your imagination.
--Oh, dear, thanks.
A．which B．what C．the one D．something
____ the machine, the engineers paid much attention to the noise from it.
A．Having examined B．Being examined C．Examining D．Examined
