阅读下面短文，用括号内所给动词的适当形式填空（必要时可加情态动词或助动词）。 Lots of us have dreams of doing big business when we grow up. However, Moziah Bridges, a 14-year-old boy in the US, is now the CEO of his own company. He {#blank#}1{#/blank#} ( sell) $200,000 bow ties(领结) since 2011.
One day about four years ago, when Moziah {#blank#}2{#/blank#} (shop) for bow ties, he found they were only in "ugly" black and red. He wanted a change. So he asked his grandma {#blank#}3{#/blank#} (teach) him how to sew（缝）. and finally developed the talent of creating bow ties. However, his first bow tie{#blank#}4{#/blank#} (not look) nice. The boy never gave up and kept on{#blank#}5{#/blank#} (practice). He used colorful cloth with different pictures. His parents and friends started to like his bow ties. Then he tried to sell them online to several stores in the south. Moziah's bow ties soon {#blank#}6{#/blank#} (become) popular.
Now his business has increased quickly. As Bridges' mother said, "You don't have to wait until you're older. If you{#blank#}7{#/blank#} (have) a dream, just go for it."
