By the end of the 21st century, scientists__________a cure for the common cold.
Đáp án B
Khi có trạng từ chỉ thời gian “By + một khoảng thời gian nào đó trong tương lai”, ta dùng thì tương lai hoàn thành: will/shall + have + V3
Ann's encouraging words gave me _________ to undertake the demanding task once again.
The local people insisted that the road_________50 cm more so that, in case of flood, they still can travel on it.
He did not share his secrets with other people but he ________in her.
The girl __________ design had been chosen stepped to the platform to receive the award.
My boss's plane___________at 10:15 tomorrow morning, but I cannot pick him up.