1．The doctor doesn’t ____________(允许) the patient to go upstairs until her leg is better.
答案：permit
2．The impression she had made on me seemed to ____________(逐渐变弱) gradually from my mind.
答案：fade
3．The ____________(现象) that rivers freeze in cold winter is common in this area.
答案：phenomenon
4．The black did not know which part of Africa their ____________(祖先) had come from.
答案：ancestors
5．Police dogs are used to ____________(嗅) out unlawful drugs which are hidden somewhere.
答案：sniff
6．Don’t ____________(压) this ball hard; otherwise you will get it blown up.
答案：press
7．Modern international business is believed to come from this ____________(最初的) trade form.
答案：initial
