用所给词的适当形式填空。（1）We {#blank#}1{#/blank#} (know) each other for two years.
（2）We {#blank#}2{#/blank#} (learn) more than l,000 new words since we {#blank#}3{#/blank#} (come) here.
（3—）How long {#blank#}4{#/blank#} you {#blank#}5{#/blank#} (be) in America?
—For about ten years.
（4）The old man works very hard. He {#blank#}6{#/blank#} (plant) about 200 trees on both sides of the road this year.
（5）—When {#blank#}7{#/blank#} you {#blank#}8{#/blank#} (see) her?
—To be honest, I {#blank#}9{#/blank#} (not see) her since she left our hometown.
（6）I {#blank#}10{#/blank#} (have) three pieces of bread, but I want {#blank#}11{#/blank#} (have) another one because it is very delicious.
（7）—Mum, I {#blank#}12{#/blank#} (finish) my homework. May I {#blank#}13{#/blank#} (go) out to play with my friends now?
—Of course.
