With such an ecological variety, amazing natural beauty, and so much to do, it's _______ that the falls are a wonder.
A. no doubt B. no way C. no wonder D. no problem
Having finished the work, _______.
A. it was almost six o’clock
B. supper was ready
C. a postman came and delivered some letters.
D. we had a rest and then had supper
---When was Tom bitten by a snake?
---It was on a Sunday _______ he was taking a trip to the mountainous area.
A. that B. when C. which D. where.
When this new kind of virus broke out at first in Mexico, no one had the least idea that it would _______ so rapidly throughout the world.
A. export B. spread C. expand D. deliver
---Is the new job a real challenge for him?
---Well, _______ difficulties he meets，I believe he will never lose heart.
A. however B. whenever C. whatever D. Whichever
“___________ race” means that two people form a group with their on-leg tied and they will walk for contest with three legs.
A. three-legging B. three-legged
C. three-legs D. three-leg
