Sorry, I have to ________ now. It’s time for class. — OK, I’ll call back later.

in the lab, ________ was taken charge of by Professor Curie, _______ theydid the experiment

I don’t know the reason _____ you were absent from the meeting, and I am not sure that someone will tell me the reason _____ you haven’t told me.

How far is it from the railway station to the hotel—It’s about _______ walk.

按要求选择。小王家的百货店要开张营业，朋友小张准备送一副对联表示祝贺，下列祝贺语恰当的一项是：