A.Traveling abroad is what my brother usually does.
B.My brother has traveled abroad for a long time.
C.What my brother hasn’t done is traveling abroad.
D.My brother used to travel abroad.

A.Knowing about the Internet helped him invest in some computer companies.
B.He didn’t know much about the Internet so he didn’t invest in any computer companies.
C.Knowing about the Internet, he would have invested in some computer companies
D.He would have invested in some computer companies without his knowledge of the Internet.

A.Jack offered to go sailing that weekend.
B.Jack denied going sailing that weekend.
C.Jack refused to go sailing that weekend.
D.Jack suggested going sailing that weekend.

A.No sooner had he arrived at the airport than he called home.
B.He arrived at the airport sooner than he had expected.
C.Calling home, he said that he had arrived at the airport.
D.He arrived at the airport and called me to take him home.

A.No matter how hard you work, you will never be promoted here.
B.You will never be promoted here; however you work hard.
C.If you didn’t work hard, you would never be promoted here.
D.Although you work really hard, you will be promoted here.

A.I cannot attend The People’s Police Academy because I am very tall.
B.I am not tall enough to attend The People’s Police Academy.
C.I am too tall to attend The People's Police Academy.
D.In spite of being tall, l cannot attend The People's Police Academy.

A.I have never attended such an enjoyable wedding party before.
B.The first wedding party I attended was enjoyable.
C.I had the first enjoyable wedding party.
D.My attendance at the first wedding party was enjoyable.

A.Hardly the man in black jacket had approached the bank when the guard stopped him.
B.Only when had the man in black jacket approached the bank, the guard stopped him.
C.No sooner had the man in black jacket approached the bank than the guard stopped him.
D.Not until had the man in black jacket approached the bank did the guard stop him.

A.Thank you. I’d love to.
B.Yes, please. Just a little.
C.No, thanks. I think I can do it.
D.You’ve got to be kidding. I thought it was bad.

A.\( - {90^0}\)
B.\({200^0}\)
C.\( - {60^0}\)
D.\( - {60^0}\)