一Ready to give up guessing，Sandy?
一No，no，hold on! I think I______ at the answer now．
| A．arrive | B．am arriving | C．have arrived | D．will arrive |
He spared no efforts to make himself _______ but failed.
| A．understand | B．understanding | C．understood | D．to understand |
Jack, look! Everybody is doing homework quietly. ______ you make a noise in class?
| A．Could | B．Shall | C．Will | D．Must |
You’d better not leave the medicine_______ kids can reach it.
| A．who | B．where | C．which | D．when |
There are about 85% of adults _______ the idea of a ban on smoking.
| A．welcome | B．to welcome |
| C．welcomed | D．welcoming |
Temperatures________ quite dramatically at night in mountains, so put on some warm clothes before going out.
| A．are dropped | B．drop |
| C．are being dropped | D．have dropped |