She usedto when other people are talking

(2013·高考新课标全国卷Ⅱ)Since nobody gave him any help，he________have done the research on his own.

I’m going on a trip to the UK after the exam.—Really _______!

New surveys suggest that people are more stressed and working longer hours than ever with technological tools constantly ______[ ]

－Do you know _______ World Water Dayis－On March 22nd.