Charlie Chaplin found __________ difficult to entertain the audience at first.
| A．it | B．that | C．one | D．this |
During the last three decades, the number of people participating in physical fitness programs ___ sharply.
| A．was increasing | B．has increased |
| C．had increased | D．will be increasing |
When the group discussion is nearing its end, make sure to ____it with important points.
| A．conclude | B．lead | C．avoid | D．hold |
Eye doctors recommend that a child’s first eye exam ____at the age of six months old.
| A．was | B．be | C．were | D．is |
______how others react to the book you have just read creates an added pleasure.
| A．Hearing | B．Hear | C．Having heard | D．To be hearing |
If we leave right away, ____we’ll arrive on time.
| A．hopefully | B．curiously | C．occasionally | D．gradually |