In the old days, people lived in caves and they had to make a fire _________themselves warm. 
#50642
A
to keep
B
keeping
C
keep
D
kept
推荐题目
At the end of the road, you can see my new house ______ a window ______.
#48998
A
with; opened
B
with; open
C
has; opened
D
has; open
The teacher often tells Jim and David _______ too much time _______ computer games.
#49300
A
not to spend, playing
B
not to spend, to play
C
don’t spend, playing
D
shouldn’t take, on
Thank you for______us,Mr Li 
#49958
A
help
B
helps
C
helping
D
helped