【推荐1】I was too young ________ (know) how to solve the problem.（所给词的适当形式填空）

【推荐2】Lily had to call a taxi because the box was ____________heavy to carry all the way home. (用适当的词填空)

【推荐3】Because of the tight timetable, he was once too tired ___________(work).

【推荐1】It’s up to the travel companies________(warn) customers of any possible danger. （所给词的适当形式填空）

【推荐2】The book is said _____ (translate) into English.

【推荐3】单句语法填空
1. Weak buildings fell down in the earthquake but strong ones stayed____________.
2. On getting to the kindergarten，the mother was glad to see her baby well ____________ (care) for.
3. With Helen’s strong will and intelligence，combined with her teacher’s skill and patience，they ____________ (overcome) all the difficulties.
4. —It’s a long time since I saw my sister last time.
—Why not ____________ (visit) her this weekend?
5. She has many ____________ (acquaint) in the business community.