It was when we were returning home ________ I realized what a good feeling it was to have helped someone in trouble.
| A．which | B．that |
| C．where | D．how |
____ can be seen in the chart right here, the air pollution level in the city has been increasing over the last months.
| A．What | B．It | C．that | D．As |
He states that good qualities such as honesty and self-discipline make ____he is today.
| A．whom | B．how | C．what | D．which |
It’s true that whoever ____positive for H7N9 will receive free medical treatment from our government without delay.
| A．is tested | B．is being tested | C．has tested | D．tests |
______ his solid evidence, the judge declared him innocent in court and set him free immediately afterwards.
| A．Believing | B．Have believed | C．Believed | D．To believe |
Excuse me, I want to borrow a book that gives a detailed______ of Alice Munro, who won this year’s Nobel Prize in Literature.
| A．account | B．imagination | C．reference | D．impression |