It rained a lot during their journey, so they _____ have had a good time. [ ]

_____ Lily _____ Lucy may go with you because one of them must stay at home.

_________the difficult problem,the professor continued to do his experiment. [ ]

This pair of jeans looks nice_____ Sandybecause she looks very nice_____ blue.

Is everyone here— Not yet．Look，there ______________ the rest of our guests!