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
When you read English,          translate every word into Chinese.
#50175
A
try not to
B
try to
C
don’t try
D
not try
 My sister spends too much time ______computer games.
#48699
A
to play
B
play
C
plays
D
playing
–-What do you think of New York City?      ---It’s a good place _______.
#50000
A
have fun
B
having fun
C
to have fun
D
for funny
One way _____ this problem ______ search for some information on the Internet.
#49168
A
solve; is to
B
to solve; is to
C
to solve; is
D
solve; is