Question 45: The mystery ………. immediately. A. cannot be solved B. can solve C. cannot be solve D. can be solve Question 46: The problem is believed ………. at the meeting last week.(BĐ cách 2: QKĐ-> to have V3/ed) A. to be discussed B. to have been discussed (bị động) C. to discuss D. to have discussed (chủ động) Question 47: Our plan ………. by the members of the committee. A. considered B. is being considered C. will considered D. is being considering Question 48: The children’s song ………. by one of the parents. A. are taping B. is taping C. are being taped D. is being taped Question 49: That book ………. by a famous writer. A. wrote B. is writing C. was written D. has written Question 50: A new hospital ……….. here next month. A. has been built B. was built C. is built D. will be built Giải giúp mình!