______ I'm willing to help, I do not have much time available．
| A．While | B．When | C．Once | D．Since |
The growing speed of a plant is influenced by a number of factors, _____are beyond our control.
| A．most of them | B．most of which |
| C．most of what | D．most of that |
— It’s surprising that your brother Russian so quickly.
— He hasn’t lived there very long.
| A．dressed up | B．set up |
| C．picked up | D．made up |
It was yesterday evening________ you had the electricity cut off in your house.
| A．when | B．that | C．which | D．in which |
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 |