用所给动词的适当形式填空。

小题1:He________(prefer) outdoor activities to films last year.

小题2:No country _________(make) such great progress as China in the past thirty years

小题3:-- I called you this morning, but nobody answered it.

-- Oh, I ____________ (iron) shirts in the bedroom.

小题4:We should prevent air pollution ____________(live) a happier life.

小题5:We hope that more charity shows ________(hold) to raise money for Project Hope.

制动阻力装置中，真空阻力器结构简单，质量轻，故障少，多用于（）。

A.小型汽车

B.中型汽车

C.重型汽车