The traffic on the main streets has a longer green signal than that on the small ones. What does the underlined "that" refer to?
A.the traffic B.the signal C.the street D.the time
His study is in______: his house keeper has long since given up trying to put his papers in order.
A.trouble B.danger C.collision D.chaos
He is due to ________ a conference on some current affairs, including unemployment and education, next week.
A.address B.preview C.instruct D.assess
Besides British citizens, the new traffic law will also ______ to foreign drivers.
A.appeal B.refer C.apply D.attend
At the graduation ceremony, the head master _______ the degree certificates to the students one by one.
A.showed B.presented C.awarded D.delivered
Since the concept introduced in this session is complex and abstract, students are given some time to _____ it.
A.consult B.explain C.digest D.accept
