Last night Mr. Crook didn’t come back at the usual time. ______, he met some friends and atayed out unitl midnght.
We found ________ necessary to protect the environment.
-Which would you like, rice or noodles? --_______is OK. I'm hungry.
I don't think it very expensive to buy a family computer here. -- Really? I'll buy _______ next week.
Lucy knew nothing about it ________ her sister told her.
He walked ________ fast for us ________catch up with.