【推荐1】It is calculated that European railways alone spend ________(approximate) 20 billion euros a year on maintenance, including sending maintenance staff, often at night, to inspect and repair the rail infrastructure.（所给词的适当形式填空）

【推荐2】The journey took ________(approximate) seven hours. （所给词的适当形式填空）

【推荐1】If both sides agree, the contract can be renewed ________ (annual)．（所给词的适当形式填空）

【推荐2】We are waiting ________(anxious) for our exam results. (所给词的适当形式填空)

【推荐3】The simplest rule to remember if you are trying to show is just to write details ________. (specific)   (所给词的适当形式填空)