My friend Jack is an explorer. Last month he persuaded us to participate his adventure on the sea. On the way,he warned us to try to take measures（protect） ourselves. When we were under the sea, a great white shark attacked us. We had no choice but （fight） against it because we couldn't escape.(fortunately), we survived eventually before our strength (run) out.
Tom isexchange student from England, is always curious everything he sees and hears. He attempts(learn) Chinese well, and he can have his homework finished based what the teacher requires.He often takes part heated discussions and gives his own comments. We often observe him(study) late into night. As a result, he（win） several awards so far. Just as the saying goes, "The more diligent you are, the(lucky) you are." All in all, we think he will be equal a challenging task so long as he is careful. However, we all think he should pay attention his health in case it breaks down.
