英语选修7人教新课标unit 4同步练习（6）及答案
ⅰ.用括号里所给动词的适当形式填空
1．________________(tell)many times, he still couldn't understand what the professor said.
2．i think the dictionary published this year is worthy of ________________(buy)．
3．________________(expose) to sunlight for too much time will do harm to one's skin.
4．the foreign friends you referred to are looking forward to ________________(show)around our newly built language lab.
5．we have to go now, for we can't risk ________(punish) by our teacher.
6．what frustrated joanna
