Sam is doing some about the ancient Silk Road．（　　）

A．exerciseB．operations

C．researchD．experiments

Did you enjoy in Chengdu last week？

Yes，I had great fun there．（　　）

A．myselfB．yourselfC．ourselvesD．themselves

While traveling in a strange place，you'd better the local people and follow their customs （习俗）．（　　）

A．watchB．changeC．controlD．teach

As soon as I heard the news that I passed the driving test，I felt at once．（　　）

A．angryB．relaxedC．afraidD．nervous

A woman stood ______ the window，watching the children playing games in the garden．（　　）

A．pastB．throughC．acrossD．by