Evidence has been found through years of study _____ children’s early sleeping problems are likely to continue when they grow up.
| A．why | B．how | C．that | D．whether |
At school, some students are active ________some are shy, yet they can be good friends with one another.
| A．while | B．although |
| C．so | D．as |
Leave your key with your neighbor ________ you lock yourself out one day.
| A．as long as | B．even though |
| C．in case | D．as if |
You have to move out of the way ________ the truck cannot get past you.
| A．so | B．or | C．and | D．but |
One's life has value________ one brings value to the life of others.
| A．so that | B．no matter how |
| C．as long as | D．except that |
（2013·辽宁卷)One can always manage to do more things，no matter full one’s schedule is in life.
| A．how | B．what | C．when | D．where |