1．Mary has been on a ______(节食) for weeks but still hasn’t lost any weight.
2．He pushed against that big stone with all his ________(力气)．
3．There is a time _______(限制)：you must finish it in 30 minutes.
4．The two men in the fight ________(怒目而视) at each other.
5．You will ________(受益) a lot from morning exercises.
