According to IQ scores, you are smartest from 18 t0 25, but you're wiser and more experienced _______ increasing age.
| A．for | B．with | C．at | D．of |
．（重庆卷25）. To improve the quality of our products, we asked for suggestions had used the products.
| A．whoever | B．who | C．whichever | D．which |
（天津卷14）. As a new graduate, he doesn’t know _______ it takes to start a business here.
| A．how | B．what | C．when | D．which |
. How much one enjoys himself travelling depends largely onhe goes with，whether his friends or relatives.
| A．what | B．who | C．how | D．why |
（陕西卷18）. It never occurred to me _____ you could succeed in persuading him to change his mind.
| A．which | B．what | C．that | D．if |
. Before the sales start, I make a list of ______ my kids will need for the coming season.
| A．why | B．what | C．how | D．which |