Rather than sticking to the principles stubbornly, China is now adopting a new concept in economic policies in a/an _______way that shows its own characteristics.
| A．sustainable | B．flexible | C．invisible | D．available |
Althougheverythingseemstohavebeentakenintoconsideration, ____accidentcan happen whentheastronautswalkin_____space．
| A．不填；the | B．an；不填 | C．the；the | D．an；the |
---- It is said that Tom had a wonderful time at the party.
---- ______, and so did I.
| A．So did he | B．Nor did he | C．So he did | D．Nor he did |
My brother gave me a present for my birthday but I gave him nothing ______ his.
| A．in return | B．by turns | C．in turn | D．in return for |
The top student failed again in the examination and only then ______ the importance of reading and memorizing the English texts.
| A．he realized | B．he had realized | C．had he realized | D．did he realize |
Please don’t get too close to the building______ roof is under repair.
| A．which | B．of which | C．whose | D．that |