The beautiful town, _____ we spent our summer vacation last year , lies at the foot of a mountain．
A． whose B． which C． where D． why
—It’s such a beautiful day． Why not have a picnic with us?
—_____． But I have a lot of homework to do．
A． Don’t mention it B． It’s up to you
C． I have no time D． I’d love to
—Listen! There is a knock on the door． Who _____ it be?
—It must be Jack． Just now I sent for him．
A． shall B． can C． must D． might
—What made her so happy?
—_____ her son passed the driving test．
A． That B． Because C． Since D． When
I would have come earlier, but I _____ that you were waiting for me．
A． didn’t know B． hadn’t known
C． haven’t known D． wouldn’t have known
During the opening ceremony, “Miss Smile” has won the hearts of Chinese Internet users after being caught _____ the same smile for nearly 20 minutes．
A． fixed B． to be fixed
C． to fix D． fixing
