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.
