---Answer the doorbell, please. It must be your uncle.
---It Heidi. She’s coming over this morning to help me with my math.
| A．is | B．can’t be | C．could be | D．will be |
In the end I lost my ______ and shouted at her.
| A．character | B．manner | C．benefit | D．patience |
Lewis was much admired ______ his work on the advanced medical research.
| A．on | B．in | C．for | D．with |
The pilot, whether ______ or design, made the plane do a sharp turn.
| A．by accident | B．at times | C．suddenly | D．all at once |
If you ______ go, at least wait until the rain stops.
| A．can | B．must | C．should | D．would |
The reason for his success is ______ he worked very hard.
| A．why | B．that | C．whether | D．how |