The atmosphere of the earth ______ us from the strong sun light.
| A．prevents | B．keeps | C．stops | D．protects |
---- I followed your advice on how to learn English, but I am still poor in it. Why?
---- Well, ___________.
Film has a much shorter history, especially when __________ such art forms as music and painting.
| A．having compared to | B．comparing with | C．compare with | D．compared with |
It is the educational system, rather than the teachers, _______ is to blame for the students’ heavy burden nowadays.
| A．who | B．this | C．that | D．whom |
---- Did he come back early last night?
---- Yes. It was not yet eight o’clock _______ he arrived home.
| A．when | B．that | C．before | D．until |
After a few days together, they got to the point _______ they could read each other’s thought.
| A．which | B．that | C．where | D．when |