1 . It was only when I started to reflect on the day ___________I had made a huge mistake.

A．did I realize

B．that I realized

C．had I realized

D．when I realized

2 . It was in the middle of the night________ my father woke me up and told me to watch the football game.

A．that

B．as

C．which

D．when

3 . It is the production of food, not its transport, ________ uses most of the energy.

A．who

B．which

C．that

D．whose

4 . It was not until she took off her sunglasses ________ I could recognize her.

A．when

B．which

C．that

D．who

5 . It was the culture, rather than the language, ______made it hard for him to ______the new environment abroad.

A．that; adapt to	B．which; contribute to
C．which; live up to	D．that; get down to

6 . It was in this old school ________ the government built in 1968 ________ he received good education.

A．where; when

B．which; that

C．that; which

D．where; which

7 . It was in the street ______________I met my old friend.

A．where

B．which

C．in which

D．that

8 . It is in the hall _____ can house 10,000 people _____ the opening ceremony of the Global 5G Technology Summit will be held.

A．which; that	B．where; that
C．which; who	D．that; where

9 . It was not until she arrived at the cinema ______she remembered her appointment with the doctor.

A．where

B．when

C．that

D．and

10 . It was not until he got sick seriously _______ he realized the value of a healthy body.

A．when

B．as

C．and

D．that