---- Pity you missed the lecture on nuclear pollution. ---- I _________ it, but was busy preparing for a job interview.
Hoping he would not disturb his sleeping father , Bob stole in , _____ and waited for him to wake up .
Being popular with customers , the products _____ well and ____ in two months .
Hill often attends lectures at Nanjing University , chiefly ____ his knowledge about hobbies .
.Saving resources is a basic policy of our country . And it proves _____ to its sustainable development .
._______ after a long walk , Mr Yang called and said he couldn’t come .