I am so tired，for I ________ English for 2 hours.
A．is studying B．have been studying
C．was studying D．had been studying
—Shall we go out to the seaside this weekend?
—________ Ring me up at any time.
A．Hold on，please. B．What for?
C．That depends. D．Sounds good.
It was Tom ________ is a soldier ________ saved the little girl from the water yesterday.
A．that；that B．whose；whom
C．who；who D．that；who
The government has made laws to protect animals，so the number of the endangered animals ________ in recent years.
A．had grown B．grew
C．has grown D．is growing
There is an ongoing debate about the potentially harmful effects ________ text messaging can have on people's grammar.
A．what B．who
C．that D．whose
We invited her to dinner but she didn't bother to ________.
A．turn on B．turn away
C．turn up D．turn out
