People from all walks of life are eager for success, ______lack of confidence, however, is a great barrier.

A. where    B. which

C. to which    D. beyond which

Important _______ having an ambition is, it must be channeled in the right direction. Otherwise, it would ruin ourselves and others.

A. though    B. if

C. when    D. while

The suspect couldn’t ______ the fact that his finger-prints were on the knife.

A. refer to    B. subscribe to

C. account for    D. make up

Unlike watching television, which requires no thought process, reading is an active learning experience that will keep your mind ________.

A. casual    B. skeptical

C. sharp    D. accurate

—I heard Mr Morgan would be here at 4:00 pm next Thursday.

—No, he _______ at that time.

A. was boarding    B. would be boarding

C. is boarding    D. will be boarding

Considerable evidence has been found over the years ________lack of exercise is connected with increased risk of cancer.

A. whether    B. that

C. why    D. how

I kept ______ the incident, asking myself again and again how it could have happened.

A. chewing on    B. sticking to

C. referring to    D. relying on

Not everybody agrees to the plan. Some support it, while I am one of       opposed to it.

A. who    B. those who

C. which    D. those

The river ________ at least 50 meters in width, but the ten-year-old boy can swim across it within minutes.

A. is measured    B. measures

C. is measuring    D. is being measured

短文改错

Su Daoquan, aged 65, was a retired man in Hechuan of Chongqing. He got a lot of attention to local people earlier this month during the first public appearance of his specially invention — a water boat. The opening performance of his pedal boat given on the nearby Fujiang River in front of a crowd of more than 100 onlookers. The pedal boat is 2.6 meters long and 1.4 meters wider. It has empty metal containers on both sides. The pedals are used to turn to a pedal wheel. The driver can ride it in the center or there is room for two other adult. He said that invented it brought him a lot of joy and that our creation is not harming the environment and is suitable for tourism.