My English teacher advised I _____ keep my mouth shut to improve my spoken English.
| A．to |
| B．not to |
| C．not |
| D．mustn’t |
—Good morning. Doctor Brown’s office.
—Hello, this is Tom Smith. Could you please tell Doctor Brown I ____? My car____ start.
A.was delayed，doesn’tB. will be delayed, won’t
C. am delayed, didn’tD would delay, mustn’t
The cause he had devoted himself to __________a perfect success.
| A．proving | B．proved | C．was proved | D．has been proved |
— Have you handed in your papers?
—Yes, we have. I guess they ___________ now.
| A．have corrected | B．are corrected | C．are being corrected | D．are correcting |
The company _______ a rise in salary for ages but nothing has happened yet.
| A．has been promising | B．had promised | C．promised | D．promises |
—Why does the river smell terrible?
—Because large quantities of water__________．
| A．have polluted | B．is being polluted | C．has been polluted | D．have been polluted |