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.
