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1、 There not be any difficulties since you have practiced a lot.（填写适当的情态动词）
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2、 It is demanded that all stores not sell cigarettes to anyone under 18.（填写适当的情态动词）
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3、 Anyone who wants to get the driving license pass the eye test.（填写适当的情态动词）
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4、 You not have treated Tom in that way. It was unfair.（填写适当的情态动词）
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5、 He had known the matter before you told him, so you not have told it to him.（填写适当的情态动词）
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6、 Since the ground is white. it have snowed last night.（填写适当的情态动词）
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7、 They have missed the plane, or perhaps they have been prevented from coming for some reason.（填写适当的情态动词）
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8、 We have studied last night, but we went to the concert instead.（填写适当的情态动词）
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9、 I didn't see her in the meeting room this morning. She not have spoken at the meeting.（填写适当的情态动词）
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10、 I didn't hear the phone. I have been asleep.（填写适当的情态动词）
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11、 I can't find Mr. Smith anywhere in the office building. Where he have gone?（填写适当的情态动词）
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12、 He decides to donate money to the mountain area so that children there receive further education.（填写适当的情态动词）
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13、 You take TOEFL or ELTS test if you want to study abroad.（填写适当的情态动词）
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14、 Anyone who wants to be a firefighter have a sharp mind and calm nerves.（填写适当的情态动词）
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15、 The custom of giving gifts at Christmas be traced back to the Wise Men bringing gifts to the baby Jesus.（填写适当的情态动词）
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16、 You switch off your electronic devices when taking a plane.（填写适当的情态动词）
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17、 The customers insisted that action be taken to ensure the safety of food.（填写适当的情态动词）
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18、 We be careful when we are making friends on the Internet.（填写适当的情态动词）
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19、 One never be too careful when driving.（填写适当的情态动词）
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20、 I went to the doctors yesterday, I had to wait for half an hour before he see me.（填写适当的情态动词）