The snake lives ________ grassland.
| A．on | B．in | C．at | D．to |
_______ his help, we finished the work on time.
| A．Thanks for | B．Thank | C．Thanks to | D．Because |
-_____ have you worked? -Since 2 pm.
| A．How soon | B．How long | C．How often | D．How far |
We can’t work out the physics problem. Can you tell us ________?
| A．how to do | B．what to do it | C．how to do it | D．what should to do |
We’ll go shopping if it ________ rain tomorrow.
| A．don’t rain | B．won’t rain | C．isn’t raining | D．doesn’t rain |
–Whatdidyourmothersay,Tom? -Sheaskedmewhy___.
| A．mysisterwas crying | B．mysisteriscrying |
| C．ismysistercrying | D．wasmysistercrying |