1. He tried his best to solve the problem, __________ difficult it was.
A. however B. no matter C. whatever D. although
2. At this time tomorrow __________ over the Atlantic.
A. we’re going to fly B. we’ll be flying
C. we’ll fly D. we’re to fly
3. The managers discussed the plan that they would like to see ________ the next year.
A. carry out B. carrying out
C. carried out D. to carry out
