1 . There is some frost on the lawn. The temperature must __________ (drop) down under zero degree last night. （所给词的适当形式填空）

2 . Diets are most effective when __________ (combine) with exercise. （用单词适当形式填空）

3 . 语法填空

Global warming could make humans shorter.Scientists claim to have found evidence that it caused the world's first horses     1     (become) smaller nearly 50 million years ago.In fact，a team from the universities of Florida and Nebraska says,     2     has found a link between the earth heating up and the size of horses，during the last time the world heated up.The scientists used fossils to follow the evolution of horses from their earliest     3     (appear)56 million years ago.As temperatures went up，their size went     4    . The scientists say that the current warming could have the same effect     5     mammals and could even make humans     6    (small)．“Horses started out small，about the size of a small dog.What's     7    (surprise) is that after they first appeared，they then became even smaller and then dramatically increased in size，and that     8     (exact)corresponds to(符合)the global warming event，followed by cooling.”“It had been known that mammals     9     (be) small during the last warm time，    10     we hadn't realised that temperature specifically was driving the evolution of body size，”Dr Bloch said in the Science journal.

4 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Most of us relate wealth to a     1     (success) career, a big house and expensive clothes.However, a recent study,     2    (carry) out by a US-based bank and brokerage company , showed that more than six     3    ten of the people surveyed treasured time withtheir family in daily lives.

Not long ago, a spokesman for UK company Luxury Family Hotel told the Daily Mail,Society is     4    (gradual) becoming a materialistic (物质主义的) place where the message from modern famous people.    5    (seem) to be that fashion, and foreign holidays as well as expensive jewels are of great    6       (important) . However, the study shows that many people still feel things such as family and relationships, compared to    7     (spend) money,are much    8     (value) regardless of their race, age and nationality. Indeed,     9    is often the case, we leave home to seek our fortune and, when we get    10    , we go home and share with our family.

5 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Up to 82 percent of children with healthy mothers are not easy to be obese（肥胖的）, according to research. A mother,     1     has a healthy weight, exercises regularly, eats a healthy diet, doesn’t smoke and only     2    (drink) wine in moderation, is significantly less likely     3    (have)a fat child, scientists say.

And research suggests it could be more to do with nurture(养育)    4     nature, as a mother's lifestyle appears     5    (direct) linked to the health of her child. When both mother and child follow a healthy lifestyle, the risk of obesity     6    (reduce)even more, the study of more than 24,000 children found.

The study examined the medical history and lifestyles of more than 24,000 children aged nine     7     fourteen, born to almost 17,000 women in the US. Researchers looked at the link between overall mother health and likelihood of a child     8    (be) obese.

The mother's health was judged on her height-to-weight ratio(比例), her diet, amount of physical     9    (active), smoking status and how much alcohol she drank. A healthy weight and diet, regular exercise, no smoking and moderate drinking all reduce the chance of a woman having     10     obese child.