单句语法填空
（1） (2016·天津卷改编)You are waiting at a wrong place. It is at the hotel __________ the coach picks up tourists.
（2） (2015·湖南卷改编)It was when we were returning home __________ I realized what a good feeling it was to have helped someone in trouble.
（3）(2015•重庆卷改编)Bach died in 1750, but it was not until the early 19th century __________ his musical gift was fully recognized.
（4）(2015•天津卷改编)Only when Lily walked into the office __________ she realize that she had left the contract at home.
（5）(2014•福建卷改编)__________ there no modern telecommunications, we would have to wait for weeks to get news from around the world.
（6）(2014•湖南卷改编)It’s not doing the things we like, but liking the things we have to do __________ makes life happy.
（7）(2013•天津卷改编)It was not until near the end of the letter __________ she mentioned her own plan.
（8） (2017吉林东北师范大学附属中学期中考试)Some of you may have finished Unit One. __________ so, you can go on to Unit Two.
（9）(2018·河南南阳一中高三第15次考试)However, you can never imagine __________ pleasant it is enjoying the chrysanthemum if you don’t get involved.
（10）(2017·广东执信中学高三期中考试)So difficult __________ I find it to work out the problem that I decided to ask Tom for advice.
（11）(2016·四川部分名校联测改编)At the top of the hill __________(lie) an old cottage which has a wonderful view of the whole city.
（12） (2016·山东部分重点中学第二次联考)Yes, of course they celebrate Christmas here, and there are obviously displays in shops and Christmas markets, but __________ seem to be no signs of  Christmas adverts.
（13）(2016·潍坊期末改编)I recently saw a picture of me before my operation, and I know __________ a big job my chief doctor did.
（14）(2015湖南衡阳高三五校联考)Seldom __________ they watch TV those days; instead, they chatted with each other after supper.
（15） (2015福建厦门质检)Failing for the first time has made him come to know __________ important a second chance is.