Although I often send e-mails to Tom, I have never seen him _____

I like to put everything sothat I can find iteasily.

This week, the seems to change every day. One day is hot; the next day is cold.

The leaders of the Chinese mainland and Taiwan met in Singapore ________ November 7, 2015.

Mary’s score on the test is the highest in her class.— Really? She ______ have studied very hard. [ ]