单项选择题
Generally speaking, ______ immigrants cannot totally cut the tie with their motherland and be assim ilated by the foreign culture.
单项选择题 I was advised to be cautious ______ he had designs on my job.
单项选择题 You should be directly ______ with this issue to make an accurate report of it.
单项选择题 I don't know you want to keep the letter. I've ______ it up.
