【推荐1】The students in the class were divided _________six groups before they started the game. （用适当的词填空）

【推荐3】单句语法填空
1. (2021全国甲卷)It was built originally to protect the city ________ the Tang dynasty and has now been completely restored (修复).
2. (2021全国乙卷)It was not widely accepted as a travel concept ________ the late 1980s. During that time, increasing environmental awareness made it desirable.
3. (2021全国乙卷)Due to the growing popularity of environmentally-related and adventure travel, various types _______ trips are now being classified as ecotourism.
4. (2020·全国Ⅰ)The far side of the moon is of particular interest to scientists because it has a lot of deep craters (环形山), more so __________ the familiar near side.
5. (2020·全国Ⅱ)Bamboo plants are associated __________ health, abundance and a happy home.
6. (2020·全国III)The artist was finally humbled (谦卑) by the greatest artist __________ earth, Mother Nature.
7. (2019·全国Ⅰ)Modern methods __________ tracking polar bear populations have been employed only since the mid-1980s
8. (2019·全国III)We were first greeted with the barking by a pack __________ dogs, seven to be exact.
9. (2018·全国Ⅰ)The review says it is more effective at lengthening life __________ walking, cycling or swimming.
10. (2018·全国Ⅲ)I was searching __________ these three western lowland gorillas I’d been observing.
11. (2018·全国Ⅱ)Corn uses less water __________ rice and creates less fertilizer(化肥) runoff.
12. (2017·全国Ⅰ)This trend, which was started by the medical community(医学界) __________ a method of fighting heart disease, has had some unintended side effects.
13. (2017·全国Ⅱ)It ran for just under seven kilometers and allowed people to avoid terrible crowds on the roads above as they travelled to and __________ work.
14. (2017·全国Ⅲ)After school she plans to take a year off to model full-time before going to university to get a degree __________ engineering or architecture.

【推荐1】With the help of the ________ (advance) technology, we can complete the task ________ advance. (所给词的适当形式填空)

【推荐2】Please inform us of your arrival ________advance. (用适当的词填空)

【推荐3】Generally speaking, you are supposed to pay the rent three months ________ advance. (用适当的词填空)