完形填空：

　　Experiments have 1 that children can be instructed in swimming 2　　 a very early age. At a special swimming pool in Los Angles, children become expert at 3　　 breath under water before they can walk. Babies of two months 4 do not appear　　 to be reluctant (不愿) to enter the water. It is　　 not long 5 they are so accustomed to swimming that they can pick up weights from　　 the floor of the pool. A game that is very popular with these young swimmers is the　　 underwater tricycle (三轮车) race. Tricycles　　 are 6 up on the floor of the pool seven feet under water. The children compete (比赛) against each other to 7 end of the pool.　　 Many pedal (踏) their tricycles, but most of them　　 prefer to push or drag them. Some children can 8 the whole length of the pool　　 without coming up for a breath even once. Whether they will ever become future Olympic　　 champions, only time will 9 . Meanwhile, they should encourage those among us who　　 cannot swim five yards before they are gasping for 10 .

　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　 　　

1．A．done	B．succeeded	C．failed	D．proved	[   ]
2．A．at	B．for	C．in	D．of	[   ]
3．A．keeping	B．holding	C．taking	D．having	[   ]
4．A．time	B．long	C．old	D．age	[   ]
5．A．when	B．before	C．after	D．since	[   ]
6．A．picked	B．stood	C．set	D．lined	[   ]
7．A．the	B．the other	C．another	D．other	[   ]
8．A．go	B．walk	C．cover	D．run	[   ]
9．A．tell	B．say	C．speak	D．talk	[   ]
10．A．rest	B．stop	C．air	D．while	[   ]