-- How’s your tour around the North Lake? Is it beautiful?
--- It ________ be, but it is now heavily polluted (污染).
| A．will | B．would | C．should | D．must |
_______ you begin the work , you must carry it out through to the end.
| A．When | B．Though | C．Sometimes | D．Once |
I’ll start early , _______ it is dark or light .
A. howeverC. whether C. if D. though
He is so strongly built that he looks _______ he could lift an elephant.
| A．if | B．as if | C．like | D．that |
I’ll let you know ____ he comes back.
| A．before | B．because |
| C．as soon as | D．although |
She will sing a song ____ she is asked.
| A．if | B．unless | C．for | D．since |