Many scientists have believed that there may be a _________of life on the Mar．
#5631
A
mark
B
signal
C
sigh
D
sign
推荐题目
This dictionary has been ____ to us.
#6784
A
of great help
B
of very helpful
C
of quite helpful
D
very much helpful
Bill was doing a lot of physical exercise to build up his __________.
#5957
A
ability
B
force
C
strength
D
mind
In Scandinavian countries it is common ____ for the husband to stay at home to look after the baby.
#6945
A
use
B
practice
C
sense
D
idea