Alice received an invitation from her boss，________ came as a surprise.
| A．it | B．that | C．which | D．he |
It isn’tthat I should accept such an offer as that．
| A．seem | B．appear | C．likely | D．possibly |
Over the past l00 years，sea levelsteadily as a result of global warming．
| A．had increased | B．has been increasing | C．increased | D．is increasing |
It is difficult to between Mary and her younger sister
| A．decide | B．distinguish | C．explore | D．express |
You have done so much that you are pass the exam．
| A．bound to | B．turn to | C．adjust to | D．object to |
The fact has worried many scientiststhe earth is becoming warmer and wormer．
| A．what | B．that | C．though | D．which |