Middle school students are not permitted _______.
35. Everyone has periods in their lives ______ everything seems very hard.
34. I can’t thank you ______ much because without your help I ______ have won the first prize.
33.The big city has always been the dream career destination of college students. But of late a trend of heading back home ________a part of future job considerations.
32. A severe drought over the past months has left 7.5 million people without ________ drinking water in two southwestern Chinese provinces.
31. Stronger and more lasting memories are likely to be formed ________a person is relaxed.