______ takes a lot of concentration and a great sense of balance to stay on it.
| A．It | B．This | C．What | D．That |
I do every single bit of housework ________ my husband Bob just does the dishes now and then.
| A．since | B．while | C．when | D．as |
As a doctor, I _______ that I will be kind to my patients, love them and do my best to save their lives. That is my promise.
| A．assure | B．predict |
| C．purchase | D．guarantee |
He, as well as his sister, to enter Harvard University recently because of excellent behaviors.
| A．has been allowed | B．have been allowed |
| C．has allowed | D．have allowed |
—When did you last see your first teacher?
—On a party last June her 40th year of teaching.
| A．in place of | B．in celebration of |
| C．in favor of | D．in memory of |
Don’t take _____ for granted that your parents should support you all your life.
| A．this | B．that | C．them | D．it |