The monitor said that the learning method he used         improved his maths.

Last night Mr. Crook didn’t come back at the usual time. __________ , he met some friends and stayed out until midnight. 

She devoted herself ______ to her research and it earned her a good reputation in her field. 

 Though they are very busy every day, they manage to get tighter_______.

 I won’t see the film tonight. I am busy. ______, it is raining cats and dogs.