小题1:This book is not useful for today’s students.

This book is    ▲   for today’s students.

小题2: Mary has been in Hong Kong for a month.

Mary    ▲   Hong Kong a month ago.

小题3: In the past people thought the earth was flat.

People    ▲   to think the earth was flat.

小题4:The family didn’t have enough money to send her abroad.

The family couldn’t    ▲   to send her abroad.

小题5:There were about fifteen people in the room, and most of them were women.

There were about fifteen people in the room,    ▲   women.

水中总大肠菌群和粪大肠杆菌的快速测定法，适用于医院污水、生活污水、垃圾渗滤液以及其他行业（如餐饮业、食品加工等）排入地表水中的污水。