I would appreciate it ________ you call back this afternoon for the doctor's appointment.
| A．until | B．if | C．when | D．that |
At the railway station，the mother waved goodbye to her daughter until the train was________.
| A．out of sight | B．out of reach | C．out of order | D．out of place |
________by a group of children，the old man was delighted.
| A．To be surrounded | B．Surrounding | C．Surrounded | D．To be surrounding |
Learning English means _________ memorizing a huge lot of words．It involves a large amount of reading as well．
| A．other than | B．more than | C．rather than | D．less than |
Tom as well as two of his classmates _____ invited to the party.
| A．was | B．were | C．have been | D．had been |
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．though |