______that blood diseases are going to continue, we’ll have to______ them.
| A．Assumed; doing research at | B．Assuming; do research on |
| C．Assuming; do research for | D．Being assumed; do research on |
-----Did you watch the basketball match yesterday?
-----Yes, I did. You know, my brother ________ in the match.
| A．is playing | B．was playing | C．has played | D．had played |
Over the past decades, sea ice in the Arctic as a result of global warming.
| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |
—You speak very good French!
—Thanks. I __________ French in Sichuan University for four years.
| A．studied | B．study | C．was studying | D．had studied |
—Why don’t we choose that road to save time?
—The bridge to it __________.
| A．has repaired | B．is repaired |
| C．is being repaired | D．will be repaired |
The number of foreign students attending Chinese universities ________ rising steadily since1990.
| A．is | B．are | C．has been | D．have been |