Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Duy Hieu won the gold medal at the National Examination. His parents___very proud of him.
A.could have been
B.can’t have
C.can’t be
D.must have been

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
________ becoming extinct is of great concern to zoologists. 
A.That giant pandas are
B.Giant pandas are
C.Are giant pandas
D.Giant panda is

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Solar energy is not widely used ______ it is friendly to the environment.
A.since
B.although
C.in spite of 
D.because of

You look so tired! You _______out too late last night.
A.must have been
B.had been
C.had to be 
D.should have been

While Peter ________the rose bush in the back yard, the phone rang.
A.were watering
B.has watered
C.watered              
D.was watering

"Be sorry for sending the wrong information, Kate" said Rita.
A.Kate sent the wrong information, and she was sorry.
B.Rita apologized to Kate for sending her the wrong information.
C.Rita was sorry about Kate's sending the wrong information.
D.Rita was sorry for not sending Kate the information.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Ms. Brown asked me _______ in my class.
A.were there how many students
B.how many students there were
C.there were how many students
D.how many students were there

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The sign warns people ______ the dangers of swimming in this river.
A.about
B.against
C.to
D.from

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Over the past 30 years, the average robot price ______ by half in real terms, and even further relative to labor costs. 
A.is fallen
B.has fallen
C.were fallen
D.have fallen

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
If he improved his IT skills, he _______ a job.
A.will easily get
B.would easily get
C.will easily have got
D.would easily have got