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1 With immense relief. I stopped running.

A some

B enormous

C little

D extensive

2 The scientists began to accumulate data.

A collect

B handle

C analyze

D investigate

3 Jack eventually overtook the last truck.

A hit

B passed

C reached

D led

4 Sometimes it is advisable to book hotels in advance.

A possible

B profitable

C easy

D wise

5 The reason for their unusual behavior remains a puzzle.

A fact

B mystery

C statement

D game

答案：1. B 2. A 3. B 4. D 5. B