________ astronauts go on spacewalks, they wear spacesuits to keep themselves safe.
Though
Till
When
Unless
The white shirt is as ________ as the yellow one.
Daming practises English songs every day.
Which is ________ , the sun or the earth?
Jiaxing is famous ________ the South Lake.
—Our team played very well but they didn’t ______ the match. —What a pity! But cheer up, please.