Mr．Smith knows a lot about China he has never been to our country．（ ）
| A． |
although |
B． |
until |
C． |
if |
D． |
since |
A woman stood ______ the window，watching the children playing games in the garden．（ ）
A．pastB．throughC．acrossD．by
As soon as I heard the news that I passed the driving test，I felt at once．（ ）
A．angryB．relaxedC．afraidD．nervous
While traveling in a strange place，you'd better the local people and follow their customs （习俗）．（ ）
A．watchB．changeC．controlD．teach
Did you enjoy in Chengdu last week？
Yes，I had great fun there．（ ）
A．myselfB．yourselfC．ourselvesD．themselves
Sam is doing some about the ancient Silk Road．（ ）
A．exerciseB．operations
C．researchD．experiments