Occasions are quite rare ________ I have the time to spend a day with my kids.
| A．who | B．which |
| C．why | D．when |
________ a difficult situation, so you should send a message to him and give some advice to him .
| A．As he is in | B．He is in | C．Being in | D．He being in |
It was dark______ we arrived at the little town .
| A．that | B．until | C．since | D．before |
—Oh, I failed again
—Don’t lose heart. One more time, ________ you will succeed.
| A．so that | B．therefore | C．however | D．and |
Mary does every single bit of housework ______her husband Bob just does the dishes at times.
| A．since | B．while | C．when | D．as |
Tom enjoyed himself so much _____ he visited his best friend in Beijing last year.
A. that B which C. when D.where