_______a bicycle to use,you have to insert a special card.
| A．Taking | B．To take | C．For taking. | D．Taken. |
— Mom! Jack has broken a cup!
— Doesn’t matter. Accidents ________ happen.
| A．should | B．must | C．will | D．Shall |
The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
| A．until | B．though | C．because | D．Unless |
There is no doubt that _________ a goal, one needs not only knowledge but also good personalities.
| A．achieve | B．achieving |
| C．to achieve | D．achieved |
Lyn gave up the chance of going abroad, but he feels he _________ a right decision.
| A．makes | B．has made | C．had made | D．is making |
It was the deep love and encouragement of my teammates_________ helped me gain the greatest strength and meet the challenges in life.
| A．what | B．which | C．who | D．that |