一、单项填空（本题共10小题，每小题1分，满分10 分）
请从A、B、C、D四个选项中选出可以填入空白处的最佳选项。
1. Doing exercise for _________ hour every day is good for our health.
A. / B. a C. the D. an
2. —I’m a little nervous to give an English speech this afternoon.
—Come on ! Believe in ________ and you can do it.
A. myself B. yourself C. himself D. herself
3. —When was this car made? It looks so old.
—It was made _______1890.
A. in B. on C. at D. since
