29. On March 12, the students were planting trees ____ the classroom.
| A．in the back of | B．at the back of | C．to the back of | D．on the back of |
—How many times have you been to China?
—In fact, it is the first time I __________ here.
| A．was | B．am | C．had been | D．have been |
His father told me that he __________ for the United States three days __________.
| A．has left; ago | B．had left; ago | C．left; ago | D．had left; before |
Please __________ the numbers and I’m sure they will __________ more than 1, 000.
A. add up; add to B. add up; add up
C
. add up; add up to D. add to; add up
Being afraid of making mistakes, the little boy __________ answer his teacher’s question.
| A．does dare | B．doesn’t dare | C．daren’t to | D．not dare to |
Iraq has __________ too many wars since 1990, making his people __________ a lot.
| A．got through; pay | B．looked through; face |
| C．gone through; suffer | D．passed through; destroy |