一、选择方框中所给词并用其正确形式填空。
A
can must need have to had better
should shouldn't mustn't
Growing up as teenagers, we have many responsibilities and choices. There are some important rules we follow to become better people. First, we be honest with our parents and friends, because trust is the key to good relationships.
When we meet difficulties in study, we not give up easily. We ask our teachers or classmates for help—they are always ready to support us. Sometimes we stay up late to finish our homework, but we make it a habit, because enough sleep is important for our health.
We take part in more after-school activities. For our safety, we go out alone at night without telling our parents. Also, we to learn how to look after ourselves, because we become independent sooner or later.
1. 2. 3.
4. 5. 6.
7. 8. 9.
10.

1. should 有一些我们需要遵守的重要规则。
2. must 首先,我们必须对父母和朋友诚实。
3. had better 我们最好不要轻易放弃。
4. can 我们可以向老师或同学寻求帮助。
5. have to 有时我们不得不熬夜完成作业。
6. shouldn't 但我们不应该养成这种习惯。
7. should 我们应该参加更多的课外活动。
8. mustn't 晚上一定不能独自外出。
9. need need to do sth. 需要做某事。
10. have to 我们迟早不得不变得独立。

B
must can't can may might
Our earth is a warm and beautiful home for all living things, but it face many serious environmental problems if we don't care for it carefully.
From the dry deserts in the west to the green and lively lands in the east, some places have almost no rainfall in hot mid-summer, and the little plants there not get enough water to grow healthily.
Look! Those animals look so weak. They be very hungry and thirsty.
Some tiny animals hide and live underground to keep safe from extreme weather, but they stay there forever.
We take nature's precious gifts for granted.
These resources run out one day if we keep wasting them, so we protect the environment right now.
If we act now, we make our living environment better and better.
Our beautiful home can stay green and lively forever if everyone tries his best.
1. 2. 3.
4. 5. 6.
7. 8. 9.
10.

1. may 此处表示“可能会面临”,可能性适中,用 may符合语境。
2. might “有些地方几乎无降雨”是不确定的情况,可能性稍小(不是所有地方都这样),故用 might,突出语气的委婉和不确定性。
3. may 前文提到“有些地方可能无降雨”,由此推测植物“可能得不到水”,可能性适中,用 may符合语境。
4. must 根据 look so weak 可知是“一定又饿又渴”,表示肯定推测应用 must。
5. can 小动物能够躲在地下,表示“能力、能够”应用 can。
6. can't 它们不可能永远待在地下。
7. can't 我们不能把自然的馈赠当作理所当然。
8. may 资源可能有一天会用完。
9. must 表示必须,强调责任与态度。
10. can 我们能够让环境越来越好。