This is the first time that I _____ the summer palace.
A.had visited | B.have visited | C.visit | D.visited |
______ is know to all, china will be an________ and powerful country in 20 or 30 year’ time.
A.That, advancing | B.This, advanced | C.As, advanced | D.It, advanced |
When I went in , they were ____ in a heated discussion .
A.absorb | B.absorbed | C.absorbing | D.being absorbed |
The ________ for tonight’s talk is protecting the environmet.
A.title | B.subject | C.news | D.theme |
You can't camp________you like these days. Many natural areas are now under protection.
A.whichever | B.wherever | C.what | D.when |
The samples__________in quality but were general acceptable.
A.varied | B.changed | C.disagreed | D.Exchanged |