If (如果) you have problems (问题)，you can ask Tom _____ help.
#47385
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to
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in
推荐题目
There are some apples ________ the tree. There are some birds ________ the tree, too.
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on; in
B
in, in
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on; on
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in; on
Sanya is a beautiful city. There are many people here _________vacation every year.
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in
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on
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for
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to
-When did the terrible earthquake happen（发生）in Ya'an, Sichuan?-It happened____8:02____the morning of April 20th ,2013.
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on;in
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at;on
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at;in
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on;on