So __ _ that all the living things died out gradually .
| A．serious polluted the lake is | B．serious polluted is the lake |
| C．seriously polluted the lake is | D．seriously polluted is the lake |
How wonderful! The _____is made of _________.
| A．house , glass | B．house, glasses | C．houses, glass | D．houses, glasses |
What ______just now?
| A．was happened | B．were happened | C．happened | D．happens |
They ______Hong Kong twice.
| A．have gone to | B．have been to | C．have been in | D．have gone in |
A young man practised ______ English with Mr Green.
| A．speak | B．speaking | C．to speak | D．speak in |
How long ____it ___to go there by train?
| A．do, take | B．does, take | C．does, spend | D．does, play |