I wonder _______ makes him so sad.

A. what it is that　　

B. what is it that　　

C. what it is　

D. what is it

　　　　　 he referred to in his article was unknown to the general reader.?

A.That　　 B.What　　　 C.Whether　　　　 D.Where

Look at the note_____ to the door, you will see that someone paid a visit when we are away.

A. pinning　 B. pinned　　 C. being pinned　 D. is pinned

Strange things happen to time when you travel because the earth is divided into twenty-four zones(时区), one hour apart. You can have days with more or fewer than twenty-fours, and weeks with more or fewer than seven days.

If you make a five-day trip across the Atlantic Ocean, your ship enters a different time zone every day. As you enter each zone, the time changes one hour. Traveling west, you set your clock back, traveling east, you set it ahead. Each day of your trip has either twenty-five or twenty-three hours.

If you travel by ship across the Pacific Ocean, you cross the International Date Line (国际日期变更线 ). By agreement, this is the point where a new day begins. When you cross the line, you change your calendar one full day, backward or forward. Traveling east today becomes yesterday. Traveling west, it is tomorrow.

1. Strange things happen to time when you travel because _____.

A. no day really has twenty-four hours 　　　 B. no one knows where time zones begin

C. the earth is divided into time zones　　　 D. in some places one day always has twenty-five hours.

2. The difference in time between zones is _____.

   　　 　 A. one hour   　 B. more than seven days C. seven days    　 D. twenty-four hours

3. The International Date Line is the name for “_____”.

   　　 A. the beginning of any new time zone　　

B. any point where time changes by one hour

   　　 C. the point where a new day begins 　 　

D. the end of any new time zone

I wonder ____ we can solve this hard problem.

A. what else　 B. how else　　 C. that　 D. as if

The movie was really boring but we_____.

A. stuck at it　　　 B. stuck out for　　 C. stuck it out　 D. stuck it on

You’d better take some medicine with you before you leave________someone gets sick.

A．so that 　　　　　　　　　B．the moment

C．as long as　　　　　　 　D．in case