1．Was it on a lonely island ____________ she was saved two months after the ship sank?
答案：that
2．(2016·浙江卷6月)____________ the governments and scientists not worked together, AIDSrelated deaths would not have fallen since their highest in 2005.
答案：Had
3．(2019·青岛二中月考)Try ____________ he might, he could not come up with an idea for his mother’s Christmas gift.
答案：as/though
4．Along the road ____________ (be) thick and tall trees, some of them with a history of nearly 100 years.
答案：are
