Complete the gaps with an appropriate word. Then put the verbs in brackets into the correct form.

1. The park warden told us that they ... (put up) barriers around the frozen lake to prevent people ... walking on it.

2. Alison suggested ... (hold) a bazaar in order to raise money ... the homeless.

3. The Earth's atmosphere ... (heat up) and ... a result the polar ice caps are melting.

4. Our teacher asked us ... (write) a report on the consequences ... global warming.

5. Mark claimed ... (put out) the previous night's fire all ... himself.