【题目】It is amazing that Mr. Guo sailed across the world by himself________ within about 130 days.

【题目】The Anti-Japanese War ______ in 1937．

【题目】There are a lot of things for us ___________ to protect the environment.

【题目】Sharks are at the top of the food chain, _______ if their numbers drop, the ocean’s ecosystem will be in danger.

【题目】People in our area have a (color) life every day.

【题目】Many Chinese _____these black and white Tintin books ever since they were invented.

【题目】My father ___________ a doctor, but now he is a writer.

【题目】This is the best gift I______.

【题目】What _____ if I _____ my homework?

【题目】Mike often plays ______ soccer on ______ playground.