---I called you at 4:00 yesterday afternoon, but nobody answered.---Sorry, I ______ with my friends at that time.
It’s important ___ us to protect the environment and it’s wise ____ us to save water .
Although Maths is very difficult, you can’t .
-What would you like for your birthday ? What about an MP5? -Oh, to tell the truth, I ______ have an I-Pad than an MP5.
A young man at 8 p.m. last Sunday.
David is ___________ take this job. He is able to do all extra work.