With sufficient scientific information a manned trip to Mars should be _____.
| A．obtainable | B．potential | C．considerable | D．feasible |
It’s quite ____me why such things have been allowed to happen.
A. forB behindC. againstD. beyond
Listen to the two girls by the window. What language ____ ?
| A．did they speak | B．were they speaking |
| C．are they speaking | D．have they been speaking |
Hurry up! Alice and Sue are waiting for you at the school gate.
-Oh! I thought they _______ without me.
| A．went | B．are going | C．have gone | D．had gone |
They ______ on the program for almost one week before I joined them, and now we ____ on it as no good results have come out so far.
| A．had been working; are still working | B．had worked; were still working |
| C．have been working; have worked | D．have worked; are still working |
---What’s that terrible noise?
---The neighbors ____for a party.
| A．have prepared | B．are preparing | C．prepare | D．will prepare |