—Must I water the flowers now?  —No, you ________ . You __________ do it later.

－Is that Mary?－No, it _______be her. She has gone to Tokyo. 

—Why is online shopping getting more popular? —I think it _________ save a lot of time.

Now that the sign reads, “No person ______ smoke here”, please choose a seat in the smoking area over there if you _______ smoke.

------It took me about 40 minutes to ride here.------Have a drink ,please. You ________ be thirsty.